Geology Sitemap - Page 2 2016-09-26

Geology of San Francisco, California - Russian Hill
Russian Hill is one of San Francisco's geologic attractions. Page 15.

Geology of San Francisco, California - Corona Heights Slickenside
The great slickenside of Cornona Heights is one of San Francisco's geologic attractions. Page 19.

Geology of San Francisco, California - Quarry Face on Telegraph Hill
Old quarry faces on Telegraph Hill are one of San Francisco's geologic attractions. Page 21.

Geology of San Francisco, California - Yerba Buena and Treasure Islands
Yerba Buena and Treasure Islands are one of San Francisco's geologic attractions. Page 4.

Snag, North Algodones Dunes Wilderness
The Algodones Dunes support trees in places. Page 10.

Mammoth Wash in the Algodones Dunes
Mammoth Wash in the Algodones Dunes. Page 5.

Bison Rubbing Rock, Calgary, Alberta - The Polished Stone of Mammoth Rocks, Sonoma County, California
Bison rubbing rock preserved at Nose Hill Park near Calgary. Page 7.

The Chert Stack - The Polished Stone of Mammoth Rocks, Sonoma County, California
Polished chert near the Mammoth Rocks site in Sonoma County, California. Page 11.

Polished Chert - The Polished Stone of Mammoth Rocks, Sonoma County, California
Polished chert closeup near the Mammoth Rocks site in Sonoma County, California. Page 12.

Evidence of Mammoths - The Polished Stone of Mammoth Rocks, Sonoma County, California
Evidence of mammoth polish at the Mammoth Rocks site in Sonoma County, California. Page 8.

The Polish at Close Range - The Polished Stone of Mammoth Rocks, Sonoma County, California
Closeup of the polish at the Mammoth Rocks site in Sonoma County, California. Page 4.

Patches of Polish - The Polished Stone of Mammoth Rocks, Sonoma County, California
Patches of polish at the Mammoth Rocks site in Sonoma County, California. Page 5.

The Pleistocene Platform - The Polished Stone of Mammoth Rocks, Sonoma County, California
Setting of the Mammoth Rocks site in Sonoma County, California.

Modern Polish on a Bison Rubbing Rock - The Polished Stone of Mammoth Rocks, Sonoma County, California
Rock polishing by bison in Saskatchewan. Page 6.

The State of Mammoth Rocks - The Polished Stone of Mammoth Rocks, Sonoma County, California
Evidence of seismic weathering at the Mammoth Rocks site in Sonoma County, California. Page 9.

Creep at Parchester Village - North End of Hayward Fault at Point Pinole
Parchester Village displays offset curbs at the north end of the Hayward fault. Page 3.

Fault Map - North End of Hayward Fault at Point Pinole
Map of the land and fault trace at the north end of the Hayward fault.

Pinole Point - North End of Hayward Fault at Point Pinole
Looking south at Pinole Point where the Hayward fault ends. Page 8.

Southward View of Hayward Fault Trace at Point Pinole
Vegetation changes across the Hayward fault at its north end. Page 4.

Fault-Related Tilting, Pinole Point - North End of Hayward Fault at Point Pinole
The land appears tilted at the north end of the Hayward fault. Page 7.

El Paso Mountains - Red Rock Canyon State Park, California
Red Rock Canyon State Park is in California's El Paso Mountains. Page 2.

Basalt in Dove Spring Wash - Red Rock Canyon State Park, California
Basalt flows tilt into Dove Spring Wash at Red Rock Canyon State Park, California. Page 9.

Crossbedding in Tuff - Red Rock Canyon State Park, California
Tuff at Red Rock Canyon State Park, California, displays crossbedding. Page 7.

Tuff of Dove Spring Formation - Red Rock Canyon State Park, California
The Dove Spring Formation at Red Rock Canyon State Park, California, contains tuff beds. Page 6.

Dove Spring Wash - Red Rock Canyon State Park, California
Dove Spring Wash is a less traveled part of Red Rock Canyon State Park, California. Page 10.

Burrow, North Algodones Dunes Wilderness
The Algodones Dunes harbor life underground. Page 14.

Chocolate Mountains from the Algodones Dunes
The Chocolate Mountains send runoff west to the Algodones Dunes. Page 12.

Sand Dune, North Algodones Dunes Wilderness
Life thrives in the deep sands of the Algodones Dunes. Page 11.

Mudcracks, North Algodones Dunes Wilderness
Mudcracks in the Algodones Dunes. Page 13.

Desert Pavement in the Algodones Dunes
Firm desert ground surrounds the Algodones Dunes. Page 8.

Conglomerate Cobbles at Granite Point
The beach at Point Lobos is made of conglomerate cobbles. Page 8.

Conglomerate at Point Lobos
Conglomerate at Point Lobos forms spectacular outcrops. Page 5.

Granite Point, Point Lobos
Granite Point at Point Lobos exposes a conglomerate-granite contact. Page 6.

Conglomerate at Granite Point
Conglomerate outcrop at Granite Point at Point Lobos State Reserve. Page 7.

Trace Fossils in Shale, Point Lobos
Rare trace fossils tie Point Lobos and Point Reyes, now 180 km apart, together. Page 18.

Point Lobos Granodiorite Texture
Granodiorite at Point Lobos has an unusual texture. Page 3.

Whaler's Point, Point Lobos
The distinctive granodiorite at Point Lobos. Page 2.

Feldspar Phenocryst at Point Lobos
Rocks at Point Lobos have very unusual elongated feldspar phenocrysts. Page 4.

Location Map - Measuring Fault Displacement with Piercing Points
Location map showing Point Lobos and Point Reyes and the San Gregorio fault between them.

Mudstone at Weston Beach, Point Lobos
Mudstone at Weston Beach at Point Lobos. Page 9.

Conglomerate Clast, Point Reyes
Conglomerate clast at Point Reyes. Page 13.

Cobbles at Chimney Rock Beach
Cobbles at Chimney Rock Beach at Point Reyes. Page 14.

Point Reyes Conglomerate
Granodiorite boulders and cobbles occur in the Point Reyes Conglomerate, just as they do at Point Lobos. Page 11.

Fiamme-Bearing Tuff, Point Reyes Lighthouse
Fiamme-bearing welded tuff cobble at Point Reyes Lighthouse. Page 17.

Purple Porphyry, Urban Setting
The telltale purple rock linking Point Lobos and Point Reyes appears in a Berkeley sidewalk. Page 19.

Phenocryst in Granodiorite, Point Reyes
Granodiorite at Point Reyes bears large, long K-feldspar phenocrysts. Page 10.

Purple Porphyry, Point Reyes Lighthouse
An unusual purple volcanic rock exposed at Point Reyes. Page 15.

Mudstone Clast, Point Reyes Lighthouse
Colorful mudstone just like that of Weston Beach appears as clasts in the Point Reyes Conglomerate. Page 16.

Turbidites at Point Reyes
Turbidites at Point Reyes lie next to a path used by thousands. Page 12.

Help Preserve the Trona Pinnacles
America's largest collection of tufa towers needs your cooperation. Page 10.

Trona Pinnacles, Northern Group
The northern group of tufa towers in the Trona Pinnacles is not hard to get to. Page 4.

Trona Pinnacles, California
The tufa towers of Trona Pinnacles are in the Mojave Desert near Trona, California.

Trona Pinnacles, Southern Group
The southern group of tufa towers in the Trona Pinnacles requires four-wheel drive to visit. Page 5.

Tufa Structure at Trona Pinnacles
The tufa of Trona Pinnacles displays intricate structure. Page 8.

The Hayward Fault in Hayward - Fault Map
Map showing the Hayward fault. Geology.

Northern San Andreas Fault - Shutter Ridge at Alder Creek
The northernmost San Andreas fault forms a shutter ridge at Alder Creek. Page 5.

Northern San Andreas Fault - View North from Los Trancos Ridge
The San Andreas fault on the San Mateo Peninsula seen from Los Trancos Ridge. Page 23.

Northern San Andreas Fault - Fault Marked by Vegetation
The San Andreas fault is green on one side, gold on the other from the vegetation growing of different rocks. Page 13.

Northern San Andreas Fault - San Andreas Fault at Fort Ross Road
The San Andreas fault is marked on Fort Ross Road where it ruptured in 1906. Page 8.

Northern San Andreas Fault - Rocks of the Gualala Block
The San Andreas fault has brought north the Gualala block and its distinctive rocks. Page 7.

Northern San Andreas Fault - Fault Trace at Mill Gulch
The San Andreas fault crosses Mill Gulch, south of Fort Ross, just before it reaches the sea. Page 12.

Northern San Andreas Fault - Abandoned Course of Mill Gulch
The San Andreas fault pulled Mill Gulch northward until it found a new course and abandoned this one. Page 11.

Northern San Andreas Fault - Earthquake Trail at Olema, Point Reyes National Seashore
The San Andreas fault runs through Olema, where an earthquake trail takes visitors to it. Page 17.

Northern San Andreas Fault - Sag Pond in Fort Ross Orchard
The San Andreas fault forms a sag pond in the old orchard at Fort Ross. Page 9.

Northern San Andreas Fault - San Mateo Peninsula Segment
The San Andreas fault from its northern end down to San Juan Bautista, all of which ruptured in 1906. Page 22.

Northern San Andreas Fault - Fault Trace South of Fort Ross
The San Andreas fault runs along a hillside south of Fort Ross. Page 10.

Northern San Andreas Fault - Offset Fence at Los Trancos Ridge
A fence across the San Andreas fault was knocked out of line in the 1906 earthquake. Page 26.

Northern San Andreas Fault - 1906 Oak at Los Trancos Ridge
An oak tree damaged by the 1906 quake grows along the northern San Andreas fault. Page 25.

Northern San Andreas Fault - Earthquake Trail at Los Trancos Ridge
An earthquake trail in Los Trancos Open Space Preserve encounters the San Andreas fault. Page 24.

North Butte in the Sutter Buttes
North Butte in the Sutter Buttes, in California's Sacramento Valley. Page 9.

Sutter Buttes Enchanted Forest
Oak woodland and North Butte in the Sutter Buttes. Page 25.

South Butte from the Moat
South Butte seen from the Moat region of the Sutter Buttes. Page 16.

South Butte, Sutter Buttes
South Butte in the Sutter Buttes on a misty morning. Page 6.

Rampart, North Side of Sutter Buttes, California
View from the north of the volcanic rampart of the Sutter Buttes. Page 18.

Sutter Buttes Aerial Photo
Aerial photo of the Sutter Buttes in California's Sacramento Valley. Page 2.

Andesite Boulder of the Sutter Buttes
Closeup of an andesite boulder of the Sutter Buttes, in California's Sacramento Valley. Page 10.

Boulders on the Rampart, Sutter Buttes, California
Andesite boulders dot the slopes in the Sutter Buttes of central California. Page 17.

Pyroclastic Conglomerate, Sutter Buttes, California
Pyroclastic boulder in the Rampart of the Sutter Buttes. Page 23.

Geologic Map of the Sutter Buttes
Geologic map of the Sutter Buttes, displayed for a field tour. Page 8.

Gray Andesite of the Sutter Buttes
Hand specimen of gray porphyritic andesite of the Sutter Buttes. Page 11.

Sutter Buttes from the Ground
Photo of the Sutter Buttes from the floor of California's Sacramento Valley. Page 3.

Field Geologists in the Sutter Buttes
A group of touring geologists in the Sutter Buttes. Page 7.

Sutter Buttes Index Map
Index map of the Sutter Buttes in California's Sacramento Valley.

Rampart Rocks Exposed, Sutter Buttes, California
Exposure of the Rampart rocks of the Sutter Buttes. Page 20.

Rampart Rocks in Outcrop, Sutter Buttes, California
Outcrop of the Rampart rocks of the Sutter Buttes. Page 21.

Rampart Pyroclastic Deposits, Sutter Buttes, California
Pyroclastic deposits in the Rampart of the Sutter Buttes. Page 22.

Misty Hills of the Sutter Buttes
Misty hills and pasture in the Sutter Buttes. Page 27.

The Moat and Rampart, Sutter Buttes, California
The Moat and Rampart regions of the Sutter Buttes. Page 19.

Obelisk, Sutter Buttes, California
Hikers rest by a lava obelisk in the Sutter Buttes of central California. Page 26.

Red Andesite of the Sutter Buttes
Hand specimen of red porphyritic andesite of the Sutter Buttes. Page 12.

Rhyolite with Quartz Phenocrysts, Sutter Buttes
Closeup of rhyolite of the Sutter Buttes showing quartz phenocrysts. Page 15.

Rhyolite of the Sutter Buttes
A hand specimen of rhyolite of the Sutter Buttes. Page 14.

Slabs on Destiny Mountain, Sutter Buttes, California
Upturned rock beds in the Sutter Buttes of central California. Page 24.

Mafic Xenolith in Andesite of the Sutter Buttes
A mafic xenolith in porphyritic andesite of the Sutter Buttes. Page 13.

West Side of the Sutter Buttes, California
West side of the Sutter Buttes of central California, 'the world's smallest mountain range.'. Page 5.

Farm North of Sutter Buttes, California
Farm country near the Sutter Buttes of central California, 'the world's smallest mountain range.'. Page 4.

Creeping Segment of the San Andreas Fault - Linear Rock Wall in Peachtree Valley
Linear rock features may signify secondary strands of the San Andreas fault. Page 16.

Creeping Segment of the San Andreas Fault - View West of the Fault Zone
The Pinnacles and Santa Lucia Range lie west of the San Andreas fault. Page 12.

Creeping Segment of the San Andreas Fault - Central California Faults
Fault map of the creeping segment of the San Andreas fault.

Creeping Segment of the San Andreas Fault - Cholame Valley
Cholame Valley marks the southern end of the San Andreas fault's creeping section. Page 19.

Creeping Segment of the San Andreas Fault - Cienega Valley
The San Andreas fault runs the length of the Cienega Valley. Page 7.

Creeping Segment of the San Andreas Fault - View East of the Fault Zone
View over the San Andreas fault into the central California Coast Ranges. Page 11.

Creeping Segment of the San Andreas Fault - Hollister Valley
View across Hollister Valley near the creeping section of the San Andreas fault. Page 4.

Creeping Segment of the San Andreas Fault - The Parkfield Bridge
The Parkfield bridge crosses the Pacific-to-North America plate boundary. Page 20.

Creeping Segment of the San Andreas Fault - Peachtree Valley and Mustang Ridge
Mustang Ridge rises beyond Peachtree Valley near the San Andreas fault. Page 13.

Creeping Segment of the San Andreas Fault - The Pinnacles Volcanic Center
The Pinnacles volcanic center was ripped in half by the San Andreas fault. Page 9.

Creeping Segment of the San Andreas Fault - Conglomerate Boulders in Peachtree Valley
Boulders of conglomerate near the San Andreas fault testify of vanished highlands. Page 15.

Creeping Segment of the San Andreas Fault - Stream Piracy in Peachtree Valley
Spectacular example of stream piracy near the San Andreas fault. Page 14.

Creeping Segment of the San Andreas Fault - View from San Juan Canyon Road
San Juan Canyon Road overlooks the northern end of the creeping segment of the San Andreas fault, central California. Page 2.

Creeping Segment of the San Andreas Fault - Slacks Canyon
Slacks Canyon near the San Andreas fault north of Parkfield. Page 17.

Creeping Segment of the San Andreas Fault - Vineyard Canyon
Vineyard Canyon Road is the prettiest way to Parkfield to visit the San Andreas fault. Page 18.

Northern San Andreas Fault - Mouth of Alder Creek
The San Andreas fault comes ashore at the mouth of Alder Creek, near Point Arena. Page 2.

Northern San Andreas Fault - Deflection of Alder Creek
Alder Creek is deflected by movement on the San Andreas fault near Point Arena. Page 4.

Northern San Andreas Fault - Fault Trace at Alder Creek
Close-up of the San Andreas fault where it crosses Alder Creek near Point Arena. Page 3.

Northern San Andreas Fault - View South from Bodega Head
View south of Bodega Head and Point Reyes Peninsula, on the northern San Andreas fault. Page 16.

Northern San Andreas Fault - Bolinas from Stinson Beach
Bolinas seen from Stinson Beach, on the northern San Andreas fault. Page 19.

Northern San Andreas Fault - The Fault at Earthquake Beach
The San Andreas fault runs out to sea south of Fort Ross at this spot I call Earthquake Beach. Page 14.

Northern San Andreas Fault - Tectonic Boulder Mix at Earthquake Beach
The San Andreas fault mixes rock types at Earthquake Beach, south of Fort Ross. Page 15.

Northern San Andreas Fault - View North on Eureka Canyon Road
The San Andreas fault follows Eureka Canyon Road in the Santa Cruz Mountains. Page 31.

Northern San Andreas Fault - Soquel Creek Canyon, Santa Cruz Mountains
The northern San Andreas fault runs up the canyon of Soquel Creek in the Santa Cruz Mountains. Page 29.

Northern San Andreas Fault - Eureka Canyon Road Slide
Large landslide above Eureka Canyon Road in the Santa Cruz Mountains. Page 30.

Northern San Andreas Fault - View from Fremont Peak
The San Andreas fault crosses Pajaro Gap and passes San Juan Bautista in this view from Fremont Peak. Page 35.

Northern San Andreas Fault - Index Map
Index map of the northern San Andreas fault.

Northern San Andreas Fault - View South from Loma Prieta
View south from the flank of Loma Prieta shows the San Andreas fault, the Santa Cruz Mountains, and beyond. Page 32.

Northern San Andreas Fault - View North from Mussel Rock
Signs of the fault seen from Mussel Rock, on the northern San Andreas fault. Page 21.

Northern San Andreas Fault - Panorama Near Pajaro Gap
Panorama of the San Andreas fault in the southern Santa Cruz Mountains near Pajaro Gap. Page 34.

Northern San Andreas Fault - Fault Trace Near Watsonville
The San Andreas fault in the southern Santa Cruz Mountains east of Watsonville. Page 33.

Northern San Andreas Fault - Mission San Juan Bautista
The mission at San Juan Bautista is built right next to the San Andreas fault. Page 36.

Northern San Andreas Fault - Fault Scarp at Mission San Juan Bautista
The fault scarp at the mission at San Juan Bautista, built next to the San Andreas fault. Page 37.

Northern San Andreas Fault - View North of Skaggs Springs Road
Aerial view of the northern San Andreas fault north of Skaggs Springs Road. Page 6.

Northern San Andreas Fault - Stinson Beach and Bolinas
Bolinas and Stinson Beach, on the northern San Andreas fault. Page 18.

Northern San Andreas Fault - View South from Stinson Beach
Signs of the fault seen from Stinson Beach, on the northern San Andreas fault. Page 20.

Northern San Andreas Fault - View West to Ben Lomond
Looking across the northern San Andreas fault to distant Ben Lomond in the Santa Cruz Mountains. Page 28.

Mormon Rocks at Cajon Pass
Mormon Rocks at Cajon Pass at the end of the southern section of the San Andreas fault. Page 17.

San Andreas Fault in the Indio Hills
Indio Hills, raised by the southern San Andreas fault. Page 11.

San Andreas Fault Trace, North Shore
The southern San Andreas fault runs through the town of North Shore. Page 9.

Facets on the San Andreas Fault Near Coachella
Facets on the San Andreas fault near Coachella, California. Page 10.

Southern San Andreas Fault at Cajon Pass North of Devore
Cajon Pass is at the west end of the southern San Andreas fault. Page 16.

Southern San Andreas Fault Index Map
Index map of the southern San Andreas fault.

Thousand Palms Oasis on the San Andreas Fault
Thousand Palms Oasis on the southern San Andreas fault. Page 12.

Red Island, Salton Sea
Red Island, a volcano near the southern San Andreas fault. Page 2.

San Andreas Fault Trace at Salt Creek
Salt Creek exposure of the southern San Andreas fault. Page 4.

San Andreas Fault Trace South of Salt Creek
The southern San Andreas fault in the Durmid Hills. Page 5.

San Andreas Fault Trace in Stream Cut
The southern San Andreas fault is exposed in a stream gully. Page 7.

Caltech Creepmeter, San Andreas Fault Trace
Caltech deploys a creepmeter on the southern San Andreas fault. Page 8.

Upturned Beds Near San Andreas Fault
Rocks near the southern San Andreas fault are strongly tilted. Page 6.

Southern San Andreas Fault in the San Bernardino Foothills
The southern San Andreas fault runs through the foothills of San Bernardino. Page 15.

Overview of San Andreas Fault Strands
The complex San Andreas fault zone stands out in a view from Mount San Jacinto. Page 14.

San Andreas Fault at Sky Ridge Road
The southern San Andreas fault runs past the desert development of Sky Valley. Page 13.

Red Island Volcanic Rocks
Volcanic rocks from the Red Island cone, near the southern San Andreas fault. Page 3.

Salton Sea Seep Field - Gryphons and Red Hill
Mud volcanoes and a real volcano near the Salton Sea. Page 3.

Phyllite - Picture of Chloritic Phyllite
The mineral chlorite gives the rock phyllite its green color. Page 7.

Phyllite - Accessory Minerals in Phyllite
Phyllite may contain accessory minerals within and between its cleavage planes. Page 8.

Phyllite - Outcrop of Phyllite
Phyllite appears in outcrop by a Vermont roadside. Page 2.

Phyllite - Pyrite Crystals in Phyllite
Phyllite on a Vermont roadside contains cubic pyrite crystals. Page 6.

Phyllite - Hand Specimen of Phyllite
Phyllite shows its shine in a hand specimen. Page 5.

Phyllite - Typical Silky Sheen of Phyllite
Phyllite has a sheen between that of dull slate and glittery schist. Page 4.

Slate - Scottish Outcrop of Slate
Slate crops out near Balvicar on the Scottish isle of Seil. Page 3.

Fulgurite Pictures - World Record Fulgurite
View of the world's longest fulgurite specimen. Page 3.

Fulgurite Pictures - Rock Fulgurite
Lightning-melted rock from the summit of Shastina. Page 4.

Agate - State Rock or Stone of Florida, Kentucky and Nebraska
Agate is the state rock of Kentucky and Nebraska and the state stone of Florida

Barite Roses - State Rock of Oklahoma
Barite roses are the state rock of Oklahoma. Page 2.

Bauxite - State Rock of Arkansas
Bauxite, or aluminum ore, is the state rock of Arkansas. Page 3.

Conglomerate - State Rock of Massachusetts
Conglomerate, the Roxbury Puddingstone, is the state rock of Massachusetts. Page 5.

Cumberlandite - State Rock of Rhode Island
Cumberlandite is the state rock of Rhode Island. Page 6.

Geode - State Rock of Iowa
The geode is the state rock of Iowa. Page 7.

Granite - State Rock or Stone of MA, NH, NC, SC, VT and WI
Granite is the state rock or state stone of Massachusetts. Page 8.

Limestone - Illinois State Stone and Tennessee State Rock
Limestone is the state stone of Illinois and the state rock of Tennessee. Page 9.

Marble - State Rock of Alabama, Colorado and Vermont
Marble is the state rock of Alabama and Colorado and one of Vermont's three state rocks. Page 10.

Mozarkite Chert - State Rock of Missouri
Mozarkite, a colorful chert, is the state rock of Missouri. Page 11.

Fossil Palmwood - State Stone of Mississippi and Texas
The fossil palmwood Palmoxylon is the state stone of Mississippi and Texas. Page 12.

Petoskey Stone - State Stone of Michigan
The Petoskey stone, a coral fossil, is the state stone of Michigan. Page 13.

Coal - State Rock of Utah
Coal is the state rock of Utah. Geology. Page 4.

Sandstone - State Rock of Nevada
Sandstone is the state rock of Nevada. Page 14.

Serpentine or Serpentinite - State Rock of California
Serpentine, or serpentinite, is the state rock of California. Page 15.

Slate - State Rock of Vermont
Slate is one of Vermont's state rocks, along with granite and marble. Page 16.

Thunderegg - State Rock of Oregon
The thunderegg is the state rock of Oregon. Page 17.

Serpentinite Gallery - Serpentinite Hand Specimen, Lake Berryessa
A lovely hand specimen of California serpentinite. Page 9.

Serpentinite Gallery - Serpentinite from 'Earthquake Beach'
Serpentinite from the edge of the San Andreas fault south of Fort Ross.

Serpentinite Gallery - Acicular Crystals in Serpentinite
Needlelike crystals in a serpentinite vein near Lake Berryessa, California. Page 4.

Serpentinite Gallery - Serpentinite and Blueschist
Serpentinite and blueschist may occur together, as here in the Oakland Hills. Page 18.

Serpentinite Gallery - Serpentinite Roadcut near Lake Berryessa
Serpentinite in a roadcut may originate in an ancient mud volcano. Page 14.

Serpentinite Gallery - Vermont Serpentinite Closeup
Closeup of the faulted surface of a Vermont serpentinite. Page 5.

Slate - Rainbow of Slate
Slate has a good range of earthy colors.

Slate - Pavestone of Slate
Slate is common underfoot in the form of pavers. Page 8.

Slate - Phyllite versus Slate
Slate and phyllite grade into each other, and sometimes the choice is arbitrary. Page 2.

Slate - Slate Roof Tiles
Slate makes elegant, durable roofing tiles. Page 9.

Geology of Laguna Beach, California - Santa Catalina Island
Laguna Beach is within view of the great offshore island of Santa Catalina. Page 9.

Geology of Laguna Beach, California - Laguna Beach
Laguna Beach in the town of Laguna Beach, California. Page 2.

Geology of Laguna Beach, California - Erosion Reinforcement
Counter-surf measures at Bette Davis's old house in Laguna Beach. Page 7.

Geology of Laguna Beach, California - Conglomerate of the San Onofre Breccia
Laguna Beach is a showcase of Southern California rocks, tectonics and coastal dynamics. Page 6.

Geology of Laguna Beach, California - The Crystal Image Rock Shop
The Crystal Image is a high-end rock shop in Laguna Beach, California. Page 8.

Geology of Laguna Beach, California - Laguna Beach Setting
Laguna Beach is a showcase of Southern California rocks, tectonics and coastal dynamics.

Geology of Laguna Beach, California - Shore Encroachment
Homes and waves come very close together at Laguna Beach, California. Page 5.

Geology of Laguna Beach, California - Wave-Cut Platform
Laguna Beach is surrounded by wave-cut platforms now lifted high above the sea. Page 4.

Geology of Laguna Beach, California - Hills of Laguna Beach
Laguna Beach is backstopped by young hills. Page 3.

Geology of Stinson Beach, California - Bolinas Lagoon
Pictures of this interesting beach and town near San Francisco. Page 3.

Geology of Stinson Beach, California - Diamond Ripples
Pictures of this interesting beach and town near San Francisco. Page 6.

Geology of Stinson Beach, California - Big Boulders
Pictures of this interesting beach and town near San Francisco. Page 14.

Geology of Stinson Beach, California - Altered Radiolarian Chert
Pictures of this interesting beach and town near San Francisco. Page 18.

Geology of Stinson Beach, California - Melange Bedrock
Pictures of this interesting beach and town near San Francisco. Page 16.

Geology of Stinson Beach, California - Dune Vegetation
Pictures of this interesting beach and town near San Francisco. Page 9.

Geology of Stinson Beach, California - Stinson Beach Looking East
Pictures of this interesting beach and town near San Francisco. Page 5.

Geology of Stinson Beach, California - Map of Stinson Beach
Pictures of this interesting beach and town near San Francisco.

Geology of Stinson Beach, California - Franciscan Melange
Pictures of this interesting beach and town near San Francisco. Page 15.

Geology of Stinson Beach, California - Tidal Ripples
Pictures of this interesting beach and town near San Francisco. Page 4.

Geology of Stinson Beach, California - East End of Stinson Beach
Pictures of this interesting beach and town near San Francisco. Page 20.

Geology of Stinson Beach, California - Stinson Beach Overview
Pictures of this interesting beach and town near San Francisco. Page 2.

Geology of Stinson Beach, California - Stilt Dwellings
Pictures of this interesting beach and town near San Francisco. Page 12.

Russian Iron Meteorite
Photo of iron meteorite from the Sikhote-Alin fall, eastern Russia. Page 6.

Siberian Iron Meteorite
Photo of iron meteorite from the Sikhote-Alin fall of 1947. Page 7.

Iron Meteorite Picture
Photo of iron meteorite from the Sikhote-Alin fall, Siberia. Page 5.

Meteorite Dealer
Picture of meteorites for sale. Geology.

Nakhlite, Martian Meteorite
Picture of nakhlite, a Martian meteorite. Page 11.

Shergottite, Martian Meteorite
Shergottites are meteorites from Mars. Page 12.

Tektite Meteorites
Photo of two tektites. Geology. Page 9.

Widmanstatten Pattern on Iron Meteorite
Photo of Widmanstatten pattern on an iron meteorite. Page 8.

Chondrite Meteorite Interior
Chondrite, part of the photo gallery of meteorites. Page 4.

Chondrite Meteorite
Chondrite, in the photo gallery of various meteorites. Page 2.

Chondrite Meteorite Exterior
Chondrite meteorite and its ablated outer crust, in the picture gallery of meteorites. Page 3.

Moon Rock Picture
This moon rock at the Air and Space Museum in San Diego isn't quite a meteorite. Page 10.

Sedimentary Rock Classification Diagrams - Ternary Diagram for Conglomerate, Sandstone and Mudstone
Ternary diagram to classify coarse-grained siliciclastic rocks.

Sedimentary Rock Classification Diagrams - QFL Ternary Diagram for Quartz, Feldspar and Lithics
Ternary diagram to help classify clastic sedimentary rocks by mineral content. Page 3.

Sedimentary Rock Classification Diagrams - Ternary Diagram for Sandstone, Siltstone and Claystone
Ternary diagram to classify sandstone and mudstones. Page 2.

QFL Sedimentary Rock Provenance Diagram
QFL diagram for determining the provenance of sedimentary rocks. Page 4.

QmFLt Sedimentary Rock Provenance Diagram
QmFLt diagram for determining the provenance of sedimentary rocks. Page 5.

Di Rosa Preserve, Napa Valley: Geo-Photos from the San Francisco Bay Area 9
Sculpture, vineyards and landscape at the Di Rosa Preserve, San Francisco Bay area, California. Page 10.

Oregon Outback Pictures - Abert Rim Closeup
Abert Rim close up, in the Oregon Outback. Page 4.

Oregon Outback Pictures - Outcrops at Arrow Gap
Rock outcrops at Arrow Gap, in the Oregon Outback. Page 17.

Oregon Outback Pictures - Monument Rock
Cattle patrol the front of Monument Rock in the Oregon Outback. Page 9.

Oregon Outback Pictures - Index Map
Index map of a photo tour through the Oregon Outback. Page 2.

Oregon Outback Pictures - Paleo Lake Shore
A fossil lake shore in the Oregon Outback. Page 7.

Oregon Outback Pictures - Basalt of Picture Rock Pass
Basalt of Picture Rock Pass, in the Oregon Outback. Page 13.

Oregon Outback Pictures - Picture Rock Pass
Picture Rock Pass in the Oregon Outback. Page 11.

Oregon Outback Pictures - Table Rock and Feeder Dike
Table Rock and one of its feeder dikes, in the Oregon Outback. Page 15.

Coquina, American Museum of Natural History
Photos of coquina, limestone composed of shelly fragments.

Coquina Closeup
Photos of coquina, limestone composed of shelly fragments. Page 3.

South African Coquina
Photos of coquina, limestone composed of shelly fragments. Page 2.

Sedimentary Rock Gallery - Arkose
Arkose in the gallery of sedimentary rocks. Page 14.

Sedimentary Rock Gallery - Graywacke
Graywacke from San Francisco's Baker Beach. Page 15.

Sedimentary Rock Gallery - Banded Iron Formation
Banded iron formation, in the gallery of sedimentary rocks. Page 4.

Sedimentary Rock Gallery - Bituminous Coal
Bituminous coal in the gallery of sedimentary rocks. Page 5.

Sedimentary Rock Gallery - Anthracite Coal
Anthracite coal from a Welsh mine. Page 6.

Sedimentary Rock Gallery - Conglomerate
Hand specimen of conglomerate. Geology. Page 21.

Sedimentary Rock Gallery - Coquina
Coquina is a conglomerate made of shell fragments. Page 20.

Sedimentary Rock Gallery - Dolomite
Dolomite in the gallery of sedimentary rocks. Page 8.

Chert Cobble - Sedimentary Rock Gallery
Interior of a chert cobble. Geology.

Sedimentary Rock Gallery - Chert Nodule Exterior
Exterior of a chert nodule found in the Mojave Desert.

Sedimentary Rock Gallery - Limestone
Hand specimen of fine-grained limestone. Page 7.

Sedimentary Rock Gallery - Limestone Breccia
A breccia boulder made of gray limestone. Page 23.

Sedimentary Rock Gallery - Peat
Florida peat, from the gallery of sedimentary rocks. Page 19.

Sedimentary Rock Gallery - Shale
Young shale at Ocean Beach, San Francisco. Page 9.

Sedimentary Rock Gallery - Shale, Cretaceous
Shale of the Great Valley Formation. Page 10.

Sedimentary Rock Gallery - Siltstone
Siltstone, in the gallery of sedimentary rocks. Page 11.

Sedimentary Rock Gallery - Sandstone, Pleistocene
Young sandstone crops out along the ancestral Tuolumne River in the Sierra foothills. Page 12.

Fresh Lava Pillows - Pillow Lava Gallery
Photo of fresh lava pillows at a mid-ocean ridge.

Miocene Pillow Lava at Avila Point California- Pillow Lava Pictures
Pillow lavas on the California coast at Avila Point. Page 3.

Broken Lava Pillow at Starks Knob, New York - Pillow Lava Pictures
A cracked lava pillow of Ordovician age at Stark's Knob, New York. Page 9.

Lava Pillow Cross Section, Stark's Knob, New York - Pillow Lava Pictures
Cross section of a lava pillow at Stark's Knob, New York. Page 10.

Ordovician Pillow Lava at Starks Knob, New York - Pillow Lava Pictures
Pillow lavas from the Ordovician near the upper Hudson River. Page 8.

Triassic Pillow Lava, Sierra Nevada Foothills - Pillow Lava Pictures
Triassic or Early Jurassic pillow lavas from the Lake Combie Complex in the Sierra Nevada foothills. Page 7.

Metamorphosed Pillows at Ward Creek California - Pillow Lava Pictures
Metamorphosed pillow lavas from the Mesozoic at Ward Creek, California. Page 5.

Pillow Lavas of the Cretaceous Franciscan Complex, California - Pillow Lava Pictures
Pillow lavas from the Cretaceous rocks of the Franciscan Complex crop out at Rodeo Beach just north of San Francisco. Page 4.

Jurassic Pillow Lava, Smartville Complex - Pillow Lava Picture Gallery
Pillow lavas of Jurassic age crop out on a riverbank. Page 6.

Pleistocene Lava Pillow, Lake Tahoe - Pillow Lava Gallery
Pleistocene pillow lavas from Lake Tahoe show palagonite alteration. Page 2.

Regional Parks Botanic Garden, Berkeley: Geo-Photos from the San Francisco Bay Area 2
The Regional Parks Botanic Garden in Berkeley presents the whole state's habitats in microcosm, San Francisco Bay area, California. Page 3.

Tomales Bay Greenstone: Geo-Photos from the San Francisco Bay Area 4
A large boulder of greenstone sits by Marin County's Tomales Bay, San Francisco Bay area, California. Page 5.

Marin County Serpentinite: Geo-Photos from the San Francisco Bay Area 6
Marin County serpentine outcrop, San Francisco Bay area, California. Page 7.

Siegenthaler-Kaestner Esker State Preserve - Ohio Geological Attractions and Destinations
Siegenthaler-Kaestner Esker State Preserve is one of Ohio's geological attractions. Page 10.

Trammel Fossil Park - Ohio Geological Attractions and Destinations
Trammel Fossil Park in Sharonville is one of Ohio's geological attractions. Page 11.

Kelleys Island Glacial Grooves - Ohio Geological Attractions and Destinations
Glacial grooves on Kelleys Island are one of Ohio's geological attractions. Page 7.

Agate Fossil Beds - Nebraska Geological Attractions and Destinations
Agate Fossil Beds is one of Nebraska's geological attractions.

Niobrara State Park - Nebraska Geological Attractions and Destinations
Niobrara State Park is one of Nebraska's geological attractions. Page 5.

Toadstool Geologic Park - Nebraska Geological Attractions and Destinations
Toadstool Geologic Park is one of Nebraska's geological attractions. Page 8.

Blackhand Gorge - Ohio Geological Attractions and Destinations
Blackhand Gorge is one of Ohio's geological attractions.

Caesar Creek - Ohio Geological Attractions and Destinations
Caesar Creek is one of Ohio's geological attractions. Page 2.

Cuyahoga Valley National Park - Ohio Geological Attractions and Destinations
Cuyahoga Valley National Park is one of Ohio's geological attractions. Page 3.

Hocking Hills - Ohio Geological Attractions and Destinations
Hocking Hills is one of Ohio's geological attractions. Page 5.

Hueston Woods - Ohio Geological Attractions and Destinations
Hueston Woods is one of Ohio's geological attractions. Page 6.

Nelson-Kennedy Ledges - Ohio Geological Attractions and Destinations
Nelson-Kennedy Ledges is one of Ohio's geological attractions. Page 8.

Oakes Quarry Park - Ohio Geological Attractions and Destinations
Oakes Quarry Park in Fairborn is one of Ohio's geological attractions. Page 9.

Almandine Garnet, State Gem of New York
Almandine garnet is the state gem of New York. Page 2.

Amethyst, State Gem of South Carolina
Amethyst is the state gem of South Carolina. Page 3.

Aquamarine, State Gem of Colorado
Aquamarine is the state gem of Colorado. Page 4.

Benitoite, State Gem of California
Benitoite is the state gem of California. Page 5.

Black Coral, State Gem of Hawaii
Black coral is the state gem of Hawaii. Page 6.

Star Blue Quartz, State Gem of Alabama
Star blue quartz is the state gem of Alabama. Page 7.

Chlorastrolite, State Gem of Michigan
Chlorastrolite, a variety of pumpellyite, is the state gem of Michigan. Page 8.

Fossil Coral Lithostrotionella, State Gem of West Virginia
Fossil coral is the state gem of West Virginia. Page 13.

Diamond, State Gem of Arkansas
Diamond is the state gem of Arkansas. Page 9.

Emerald, State Gem of North Carolina
Emerald, a variety of beryl, is the state gem of North Carolina. Page 10.

Flint, State Gem of Ohio
Flint is the state gem of Ohio. Geology. Page 12.

Agate, State Gem of Louisiana, Maryland, Minnesota, Montana, Nebraska and North Dakota
Agate is the state gem of Louisiana, Maryland, Minnesota, Montana, Nebraska and North Dakota.

Fire Opal, State Gem of Nevada
Fire opal is the state precious gem of Nevada. Page 11.

Tourmaline, State Gem of Maine
Tourmaline is the state gem of Maine. Page 26.

Grossular Garnet, State Gem of Vermont
Grossular garnet is the state gem of Vermont. Page 15.

Star Garnet, State Gem of Idaho
Star garnet is the state gem of Idaho. Page 23.

Jade, State Gem of Alaska and Wyoming
Jade, specifically nephrite, is the state gem of Alaska and Wyoming. Page 16.

Moonstone, State Gem of Florida
Moonstone is the state gem of Florida. Page 17.

Freshwater Pearls, State Gem of Kentucky and Tennessee
Freshwater pearls are the state gem of Kentucky and Tennessee. Page 14.

Petrified Wood, State Gem of Washington
Petrified wood is the state gem of Washington. Page 18.

Quartz, State Gem of Georgia
Quartz is the state gem of Georgia. Page 19.

Rhodonite, State Gem of Massachusetts
Rhodonite is the state gem of Massachusetts. Page 20.

Sapphire, State Gem of Montana
Sapphire is the state gem of Montana. Page 21.

Smoky Quartz, State Gem of New Hampshire
Smoky quartz is the state gem of New Hampshire. Page 22.

Sunstone, State Gem of Oregon
Sunstone is the state gem of Oregon. Page 24.

Topaz, State Gem of Texas and Utah
Topaz is the state gem of Texas and Utah. Page 25.

Turquoise, State Gem of Arizona, Nevada and New Mexico
Turquoise is the state gem of Arizona, Nevada and New Mexico. Page 27.

Olivine Phenocrysts in Basalt, Hawaii
Olivine is one of the minerals that form phenocrysts. Page 5.

Plagioclase Phenocrysts in Basalt, Abert Rim, Oregon
Plagioclase is one of the minerals that form phenocrysts. Page 6.

Pyroxene Phenocrysts in Peridotite, Klamath Mountains, California
Pyroxene is one of the minerals that form phenocrysts. Page 8.

Quartz Phenocrysts in Rhyolite, Sutter Buttes, California
Quartz is one of the minerals that form phenocrysts. Page 9.

Zircon and Hornblende Phenocrysts in Pegmatite, Pakistan
Zircon is one of the minerals that form phenocrysts. Page 10.

Orthopyroxene Phenocrysts in Gabbro, Sierra Nevada
Phenocrysts of orthopyroxene in an ophiolitic gabbro, Smartville Complex, California. Page 7.

Columnar Basalt in Eugene, Oregon
Basalt columns of Skinner Butte in Eugene. Page 12.

Columbia River Basalt in California
Continental flood basalt extends into California. Page 15.

Superimposed Basalt Flows
Stacked basalt flows preserve the surfaces beneath them. Page 13.

Basalt at Fossil Falls, California
Basalt flow of Fossil Falls was eroded by a river. Page 14.

Fresh and Weathered Massive Basalt
Basalt is black when fresh, brown when weathered. Page 2.

Hexagonal Jointing in Basalt
Basalt cracks into six-sided columns. Page 10.

Porphyritic Basalt
Basalt may be full of larger crystals, or porphyritic. Page 5.

Columbia River Basalt in Washington
Basalt flows form a rampart over the Columbia River Gorge. Page 16.

Vesiculated Basalt
Basalt is commonly full of bubbles, or vesicles. Page 4.

Massive Basalt
Basic black, massive basalt. Geology.

Pillow Basalt, Stark's Knob, New York
Basalt forms lava pillows on the earth's seafloor and here at Stark's Knob, New York. Page 18.

Alkali Feldspar Phenocryst in Quartz Monzonite, Cornwall
Alkali feldspar is one of the minerals that may form phenocrysts. Page 3.

Hornblende Phenocrysts in Granite, Truckee River, Nevada
Hornblende is one of the minerals that form phenocrysts. Page 4.

Rock with Phenocrysts, Abert Rim, Oregon
Phenocrysts may be spectacular, as in this basalt boulder in southern Oregon.

Alkali Feldspar Phenocrysts in Andesite, Inyo Mountains, California
Alkali feldspar is one of the minerals that form phenocrysts. Page 2.

Basalt with Palagonite Crust
Palagonite coats a piece of basalt. Page 3.

Pahoehoe and Aa Basalt
Basalt displays both pahoehoe and aa texture in one place. Page 8.

Profile of Aa Basalt Flow
Basalt grades from massive to aa texture within a lava flow. Page 9.

Columbia River Basalt in Oregon
Basalt makes up the amazing Abert Rim of southern Oregon. Page 17.

Amygdaloidal Basalt
Basalt vesicles may become amygdules. Page 6.

Columnar Jointing in Basalt
Thick basalt flows crack into pencil-shaped columns. Page 11.

Basalt Flow Surface
Basalt pictures. Geology. Page 7.

Shell Beach, California - Shell Beach Approach
The path to Shell Beach leads by a gully cut in massive serpentinite. Page 4.

Shell Beach, California - Serpentinite Blocks and Matrix
A block of Franciscan serpentinite exposed in the seacliff at Shell Beach, on the Sonoma County coast north of San Francisco. Page 15.

Shell Beach, California - Serpentinite and Shaly Matrix
Serpentinite and shaly matrix on the path to Shell Beach, on the Sonoma County coast north of San Francisco. Page 6.

Shell Beach, California - Shell Beach and the Sonoma Coast
Shell Beach is on the Sonoma County coast north of San Francisco.

Shell Beach, California - Diamictite
Shaly Franciscan matrix at Shell Beach may be classified as diamictite. Page 11.

Shell Beach, California - A Look into a Subduction Zone
Shell Beach vividly displays the subduction-related rocks of the Franciscan Complex. Page 9.

Shell Beach, California - Coastal Bench and Mammoth Rocks
The marine platform or wave-cut terrace at Shell Beach, on the Sonoma County coast north of San Francisco. Page 2.

Shell Beach, California - Polished Boulder
A large boulder at Shell Beach was polished under the conditions of an ancient subduction zone. Page 10.

Shell Beach, California - Blueschist in Mammoth Rock
Franciscan blueschist makes up most of the Mammoth Rocks near Shell Beach, on the Sonoma County coast north of San Francisco. Page 18.

Shell Beach, California - Blueschist Closeup
Blueschist at Shell Beach displays strong shearing from its time in an ancient subduction zone. Page 19.

Shell Beach, California - Breccia of Franciscan Matrix
The Franciscan matrix at Shell Beach may form brecciated rocks. Page 12.

Shell Beach, California - Greenschist
A large greenschist boulder at Shell Beach, on the Sonoma County coast north of San Francisco. Page 17.

Shell Beach, California - Shell Beach Seacliffs
Sea cliffs near Shell Beach, on the Sonoma County coast north of San Francisco. Page 3.

Shell Beach, California - Conglomerate
Uncommon Franciscan conglomerate appears on Shell Beach, on the Sonoma County coast north of San Francisco. Page 14.

Shell Beach, California - Intraformational Contact in Franciscan Rocks
Graywacke and serpentinite in contact at Shell Beach, on the Sonoma County coast north of San Francisco. Page 7.

Shell Beach, California - Eclogite
Shell Beach, on the Sonoma County coast north of San Francisco, has a few examples of Franciscan eclogite. Page 22.

Shell Beach, California - Graywacke of the Franciscan Complex
Shell Beach, on the Sonoma County coast north of San Francisco, displays massive graywacke of the Franciscan Complex. Page 13.

Shell Beach, California - Greenstone
Franciscan greenstone exposed at Shell Beach, on the Sonoma County coast north of San Francisco. Page 16.

Shell Beach, California - Mammoth Rocks Stack, South Side
This ancient sea stack is one of the Mammoth Rocks near Shell Beach, on the Sonoma County coast north of San Francisco. Page 23.

Shell Beach, California - Serpentinite Boulders
Serpentinite boulders along the path to Shell Beach, on the Sonoma County coast north of San Francisco. Page 5.

California Coast Geology - Pebble Beach, San Mateo County
Pebble Beach, part of Bean Hollow State Beach, is a wonderful California geologic site. Page 30.

California Coast Geology - Tar Seeps, Carpinteria Beach, California
Spectacular tar seeps at Carpinteria are one of California's coastal geologic attractions. Page 38.

California Coast Geology - View South from Bodega Head
Point Reyes is visible in the distance. Page 17.

California Coast Geology - Alder Creek
The San Andreas fault comes ashore here a little east of Point Arena. Page 7.

California Coast Geology - Wave-Cut Platform at Davenport, California
Ancient shorelines on the Santa Cruz County coast. Page 31.

California Coast Geology - Earthquake Beach South of Fort Ross
The San Andreas fault returns to sea at this nameless beach south of Fort Ross. Page 9.

California Coast Geology - Laguna Beach, California
Laguna Beach displays young sedimentary rocks in a dramatic and easily accessible setting. Page 41.

California Coast Geology - Stinson Beach, California
Stinson Beach sits east of the San Andreas fault. Page 20.

California Coast Geology - Whalers Cove at Point Lobos State Reserve
Point Lobos is a wonderland of clear waters, wildlife, kelp forests and rocks. Page 32.

California Coast Geology - Drake's Bay, Point Reyes
Sir Francis Drake's ships are said to have anchored here in 1579. Page 19.

California Coast Geology - Introduction - Marshall Beach, San Francisco
Marshall Beach is a type specimen of the California coast.

Geology of the California Coast - The Monterey Formation at Montana de Oro State Park
Montana de Oro State Park is a superb exposure of the Monterey Formation. Page 35.

Geology of the California Coast - Monterey Formation at Montaña de Oro State Park
Monterey Formation rocks close up at Montaņa de Oro State Park. Page 36.

California Coast Geology - Shell Beach Colors
A stash of boulders as colorful as a kid's marble collection. Page 15.

California Coast Geology - Shelter Cove, California
Shelter Cove is the town perched on Point Delgada. Page 6.

California Coast Geology - Beach near Trinidad Head
Beach near Trinidad Head north of Humboldt Bay, near Eureka. Page 3.

California Coast Geology - Big Sur Coast, California
The Big Sur coast is largely Franciscan rocks. Page 33.

California Coast Geology - Big Sur Rocks, California
The water is tempting while driving through Big Sur. Page 34.

California Coast Geology - Bodega Head Looking North
Bodega Head is a notable block of granitic rocks brought here from far away. Page 16.

California Coast Geology - Avila Beach, California
At Avila Beach is a world-class display of pillow lava. Page 37.

California Coast Geology - Beach North of Jenner, California
A typical beach in California's Franciscan terrane. Page 10.

California Coast Geology - Ocean Beach, San Francisco
San Francisco's western edge is a series of dune fields and seacliffs. Page 28.

California Coast Geology - Rodeo Beach and Fort Cronkhite, California
Just north of the Golden Gate is the gravel bar of Rodeo Beach with old Fort Cronkhite at left. Page 22.

California Coast Geology - Mouth of the Russian River
The Russian River brings lots of sand to the coast near Jenner during its winter floods. Page 12.

California Coast Geology - Cape Mendocino
Cape Mendocino, westernmost point in California, seen from Mattole Road. Page 4.

California Coast Geology - Islas Coronados, Mexico
To the south of San Diego's Coronado Beach lie the Coronado Islands, uplifted bits of a large offshore platform. Page 43.

California Coast Geology - Arch and Chimneys Near Jenner, California
Sea arches and chimneys are common attractions of northern California beaches. Page 11.

California Coast Geology - Lost Coast and King Range
North of Shelter Cove is the roadless King Range, also known as the Lost Coast. Page 5.

California Coast Geology - Shell Beach, California
Shell Beach is a classic place to study the variety of rocks in the Franciscan Complex. Page 13.

California Coast Geology - Angel Island and San Francisco Bay
San Francisco Bay is unique on the California coast, a huge sheltered estuary with excellent harbors. Page 25.

The 28 September 2004 Parkfield Earthquake - San Andreas Fault at Parkfield
The first hour of postseismic activity after the 28 September 2004 Parkfield earthquake. Page 13.

2004 Parkfield Earthquake Aftershocks - San Andreas Fault
First week of aftershocks from the 28 September 2004 Parkfield earthquake. Page 14.

The San Andreas Fault Plaque, Parkfield California
E Clampus Vitus has monumented the San Andreas fault segment in Parkfield, California. Page 17.

The Parkfield Interventional EQ Fieldwork - San Andreas Fault
The Parkfield Interventional EQ Fieldwork installation responding to seismic signals. Page 18.

SAFOD in the News - San Andreas Fault at Parkfield
Mark Zoback is interviewed for television, informing the public about geology research. Page 12.

SAFOD Drilling Rig - San Andreas Fault at Parkfield
The drilling rig of the San Andreas Fault Observatory at Depth (SAFOD) project north of Parkfield. Page 6.

Parkfield Bridge from Pacific Plate - San Andreas Fault
View across the Parkfield bridge from the Pacific plate side. Page 3.

Cholame Valley - San Andreas Fault at Parkfield
Cholame Valley in the Parkfield segment of the San Andreas fault.

Map of the Parkfield Segment of the San Andreas Fault
Map showing faults and topography of the Parkfield segment of the San Andreas fault. Page 5.

Carbide Drill Bits from the SAFOD Project
Used and new carbide drill bits sit on the ground at the SAFOD project site near Parkfield. Page 8.

SAFOD Drilling Profile - San Andreas Fault at Parkfield
Schematic profile and geologic section of the SAFOD drill hole across the San Andreas fault. Page 7.

Alabaster - Sedimentary Rock Types
Alabaster or massive gypsum rock is one of the sedimentary rocks.

Breccia - Sedimentary Rock Types
Breccia is one of the major types of sedimentary rocks. Page 6.

Conglomerate - Sedimentary Rock Types
Conglomerate is one of the major types of sedimentary rocks. Page 10.

Graywacke or Wacke - Sedimentary Rock Types
Wacke or graywacke is one of the major types of sedimentary rocks. Page 15.

Siltstone - Sedimentary Rock Types
Siltstone is one of the major types of sedimentary rocks. Page 24.

Diamictite - Sedimentary Rock Types
Diamictite is a messy rock that is not quite conglomerate. Page 12.

Diatomite - Sedimentary Rock Types
Picture and notes about the sedimentary rock diatomite. Page 13.

Bauxite - Sedimentary Rock Types
Bauxite is an uncommon but economically important sedimentary rock. Page 5.

Claystone - Sedimentary Rock Types
Claystone is a type of sedimentary rock. Page 8.

Porcellanite - Sedimentary Rock Types
Porcellanite is a subtle sedimentary rock type. Page 19.

Ironstone - Sedimentary Rock Types
Several types of sedimentary rocks are called ironstone. Page 16.

Amphibolite - Metamorphic Rock Types
Amphibolite is one of the major metamorphic rock types.

Blueschist - Metamorphic Rock Types
Blueschist is a major metamorphic rock type from regional metamorphism. Page 3.

Cataclasite - Metamorphic Rock Types
Cataclasite is a major metamorphic rock type from mechanical metamorphism. Page 4.

Eclogite - Metamorphic Rock Types
Eclogite is a major metamorphic rock type from regional metamorphism. Page 5.

Gneiss - Metamorphic Rock Types
Gneiss is a major metamorphic rock type from regional metamorphism. Page 6.

Arkose - Sedimentary Rock Types
Arkose is one of the major types of sedimentary rocks. Page 2.

Natural Asphalt - Sedimentary Rock Types
Natural asphalt is one of the major types of sedimentary rocks. Page 3.

Banded Iron Formation - Sedimentary Rock Types
Banded iron formation or BIF is one of the major types of sedimentary rocks. Page 4.

Chert - Sedimentary Rock Types
Chert is one of the major types of sedimentary rocks. Page 7.

Coal - Sedimentary Rock Types
Coal is one of the major types of sedimentary rocks. Page 9.

Coquina - Sedimentary Rock Types
Coquina is one of the major types of sedimentary rocks. Page 11.

Dolomite Rock or Dolostone - Sedimentary Rock Types
Dolomite or dolostone is one of the major types of sedimentary rocks. Page 14.

Rock Gypsum - Sedimentary Rock Types
Rock gypsum is one of the major types of sedimentary rocks. Page 20.

Limestone - Sedimentary Rock Types
Limestone is one of the major types of sedimentary rocks. Page 17.

Peat - Sedimentary Rock Types
Peat is one of the major types of sedimentary rocks. Page 18.

Rock Salt - Sedimentary Rock Types
Rock salt is one of the major types of sedimentary rocks. Page 21.

Sandstone - Sedimentary Rock Types
Sandstone is one of the major types of sedimentary rocks. Page 22.

Shale - Sedimentary Rock Types
Shale is one of the major types of sedimentary rocks. Page 23.

Travertine - Sedimentary Rock Types
Travertine is one of the major types of sedimentary rocks. Page 25.

Greenschist - Metamorphic Rock Types
Greenschist is a major metamorphic rock type from regional metamorphism. Page 7.

Greenstone - Metamorphic Rock Types
Grenstone is a major metamorphic rock type from regional metamorphism. Page 8.

Hornfels - Metamorphic Rock Types
Hornfels is a major metamorphic rock type from contact metamorphism. Page 9.

Marble - Metamorphic Rock Types
Marble is a major metamorphic rock type from regional metamorphism. Page 10.

Migmatite - Metamorphic Rock Types
Migmatite is a major metamorphic rock type from regional metamorphism. Page 11.

Mylonite - Metamorphic Rock Types
Mylonite is a major metamorphic rock type from mechanical metamorphism. Page 12.

Phyllite - Metamorphic Rock Types
Phyllite is a major metamorphic rock type from regional metamorphism. Page 13.

Quartzite - Metamorphic Rock Types
Quartzite is a major metamorphic rock type from regional metamorphism. Page 14.

Schist - Metamorphic Rock Types
Schist is a major metamorphic rock type from regional metamorphism. Page 15.

Serpentinite - Metamorphic Rock Types
Serpentinite is a major metamorphic rock type from regional metamorphism. Page 16.

Slate - Metamorphic Rock Types
Slate is a major metamorphic rock type from regional metamorphism. Page 17.

Soapstone - Metamorphic Rock Types
Soapstone is a major metamorphic rock type from regional metamorphism. Page 18.

Argillite - Metamorphic Rock Types
A lightly metamorphosed claystone also called pipestone. Page 2.

Kimberlite - Igneous Rock Types
Kimberlite is the peculiar deep-seated ultramafic rock most famous as the ore of diamonds. Page 10.

Andesite - Igneous Rock Types
Andesite is one of the major igneous rock types.

Anorthosite - Igneous Rock Types
Anorthosite is one of the major igneous rock types. Page 2.

Basalt - Igneous Rock Types
Basalt is one of the major igneous rock types. Page 3.

Diorite - Igneous Rock Types
Diorite is one of the major igneous rock types. Page 4.

Dunite - Igneous Rock Types
Dunite is a plutonic rock consisting of olivine. Page 5.

Felsite - Igneous Rock Types
Felsite is one of the major igneous rock types. Page 6.

Gabbro - Igneous Rock Types
Gabbro is one of the major igneous rock types. Page 7.