Geology Sitemap - Page 7 2016-09-26

Kelso Dunes, Mojave Desert, California - Late Afternoon at Kelso Dunes
The Kelso Dunes and adjoining Devil's Playground look their most picturesque at dawn and dusk. Page 25.

Kelso Dunes, Mojave Desert, California - Windward and Lee Sides, Kelso Dunes
Upwind and downwind slopes displayed at the Kelso Dunes. Page 7.

Kelso Dunes, Mojave Desert, California - View Northwest from Kelso Dunes
View of the Devil's Playground from the Kelso Dunes in the Mojave Desert. Page 23.

Kelso Dunes, Mojave Desert, California - Ripples in the Kelso Dunes
Ripple marks in sand at the Kelso Dunes in the Mojave Desert. Page 5.

Kelso Dunes, Mojave Desert, California - Sand Cross Section, Kelso Dunes
The Kelso Dunes display cross sections of eolian sediment like those in continental sandstones. Page 8.

Kelso Dunes, Mojave Desert, California - Sidewinder, Kelso Dunes
A sidewinder snake crosses the Kelso Dunes in the Mojave Desert. Page 15.

California Coast Geology - The Golden Gate, California
The Golden Gate is a strait connecting San Francisco Bay with the Pacific. Page 24.

California Coast Geology - Santa Monica Beach, California
Santa Monica is at the north end of nearly 100 kilometers of sand between here and Newport Beach. Page 39.

California Coast Geology - Santa Monica Terrace, California
The city of Santa Monica sits on a broad alluvial fan complex being eroded by the sea. Page 40.

California Coast Geology - Northern San Mateo Peninsula, California
South of San Francisco, young sedimentary rocks give way to Salinian granite. Page 29.

California Coast Geology - Shell Beach Rocks
Even gray days are colorful at Shell Beach. Page 14.

California Coast Geology - Bird Island and Point Bonita
Bird Island and Point Bonita guard the entrance to the Golden Gate. Page 23.

California Coast Geology - Granite Stacks at Bodega Head
The fractured granite of Bodega Head forms rugged stacks under the attack of the Pacific waves. Page 18.

California Coast Geology - Oakland Harbor in San Francisco Bay
The harbors in San Francisco Bay are protected from Pacific storms by hills of the Coast Ranges. Page 27.

California Coast Geology - The Golden Gate from the Oakland Hills
This view shows the Golden Gate with little Alcatraz Island in front of it and the granitic Farallon Islands beyond on the horizon. Page 26.

California Coast Geology - Gualala Block
The sliver of the California coast south of Point Arena is called the Gualala block. Page 8.

California Coast Geology - Marin Headlands
Between Stinson Beach and the Golden Gate lie high sea cliffs of Franciscan rocks. Page 21.

Mount Diablo, California, from the Montezuma Hills
Mount Diablo as seen from the Montezuma Hills. Page 6.

Mount Diablo, California, from Pleasant Hill
Mount Diablo as seen from Pleasant Hill. Page 4.

The Hayward Fault in Hayward - View Down Sunset Boulevard
Land along the Hayward fault is attractive. Page 3.

The Hayward Fault in Hayward - Curb Offset Downtown
A curb near B Street is offset by the Hayward fault in Hayward. Page 5.

The Hayward Fault in Hayward - Fault Trace at O'Connell Lane
The Hayward fault trace is kept clear of buildings near O'Connell Lane in Union City. Page 10.

The Hayward Fault in Hayward - Curb on Prospect Court
Repairs to a curb after creep on the Hayward fault. Page 4.

The Hayward Fault in Hayward - Echelon Cracks on Rose Street
The Hayward fault makes echelon cracks across Rose Street in Hayward. Page 7.

The Hayward Fault in Hayward - Offset Curb at Rose and Prospect
This corner is famous among students of the Hayward fault. Page 6.

The Hayward Fault in Hayward - Fault Trace Near Holy Sepulchre
A line of springs marks the Hayward fault in Hayward. Page 8.

The Hayward Fault in Hayward - Springs at Holy Sepulchre
The Hayward fault in its type locality. Page 9.

The Hayward Fault in Hayward - Curb Offset on Sunset Boulevard
The Hayward fault bends this curb to the right. Page 2.

1857 Earthquake Segment of the San Andreas Fault - Mile High
Mile High is a classic fault site along the central San Andreas fault. Page 10.

1857 Earthquake Segment of the San Andreas Fault - Lone Pine Canyon East End
Lone Pine Canyon houses a spectacular part of the central San Andreas fault. Page 5.

Northern San Andreas Fault - View South from Los Trancos Ridge
Southward from Los Trancos Ridge, the San Andreas fault runs toward Loma Prieta. Page 27.

1857 Earthquake Segment of the San Andreas Fault - Blue Cut, Cajon Pass
Blue Cut marks the east end of the 1857 rupture segment of the San Andras fault. Page 3.

1857 Earthquake Segment of the San Andreas Fault - Aerial View Cajon Pass to Elizabeth Lake
Aerial view of the east part of the central San Andreas fault, which ruptured in the great 1857 California earthquake. Page 2.

1857 Earthquake Segment of the San Andreas Fault - View West from Grandview Canyon
Granview Canyon surveys a large portion of the central San Andreas fault. Page 9.

1857 Earthquake Segment of the San Andreas Fault - Lone Pine Canyon
Lone Pine Canyon is a dramatic part of the central San Andreas fault near Cajon Pass. Page 6.

Chimney of the Parkfield Cafe - San Andreas Fault at Parkfield
The stone chimney of the Parkfield Cafe will interest the visiting geologist. Page 16.

Adjust the Crown-O-Matic - SAFOD Project at Parkfield
Warning sign on drilling equipment reinforces safety at the SAFOD drilling project to study the San Andreas fault. Page 10.

PIEQF in Operation - San Andreas Fault at Parkfield
The Parkfield Interventional EQ Fieldwork installation responding to seismic signals. Page 21.

Parkfield Interventional EQ Fieldwork and Webcams
The Parkfield Interventional EQ Fieldwork in Parkfield, California, had a Web presence too. Page 20.

Parkfield Interventional EQ Fieldwork and Geophone
The Parkfield Interventional EQ Fieldwork in Parkfield, California, used a geophone to make it interactive. Page 19.

Drill Cuttings at SAFOD
Grit from the borehole bottom is collected by the SAFOD project to study the San Andreas fault. Page 9.

Parkfield Ground Squirrel - San Andreas Fault at Parkfield
Local wildlife patronizes the offerings at the SAFOD drill site near Parkfield, California. Page 11.

Creeping Segment of the San Andreas Fault - Fault Trace at Buck Ridge
The San Andreas fault is well exposed on the side of Buck Ridge. Page 10.

Creeping Segment of the San Andreas Fault - Bird Creek Canyon
Bird Creek Canyon is on the creeping segment of the San Andreas fault, central California. Page 3.

Creeping Segment of the San Andreas Fault - Fault Trace Up Cienega Valley
The San Andreas fault sits in a swale at the head of the Cienega Valley. Page 6.

Creeping Segment of the San Andreas Fault - San Andreas Fault from San Benito River Valley
The San Andreas fault emerges from the Cienega Valley into the San Benito River valley. Page 8.

Creeping Segment of the San Andreas Fault - Cienega Road at Bird Creek
Cienega Road from Hollister meets the San Andreas fault at Bird Creek. Page 5.

Parkfield Cafe - San Andreas Fault
The Parkfield Cafe is famous for its hospitality among geologists studying the San Andreas fault. Page 15.

Cholame Valley Panorama - San Andreas Fault at Parkfield
Panorama of the east side of Cholame Valley, in the Parkfield segment of the San Andreas fault. Page 2.

Turkey Flat Station - San Andreas Fault at Parkfield
Seismic monitoring station on Turkey Flat Road near Parkfield. Page 4.

Landslides - Earthflow
Earthflow north of Livermore, California. Page 24.

Landslides - Wooden Valley Debris Flow
Head of a debris flow in Wooden Valley, California. Page 19.

Landslides - DeBeque Canyon Rockslide
DeBeque Canyon rockslide, Colorado, route I-70. Page 13.

Landslides - Rockfall
Rockfall on Washington route 20, 2003. Page 17.

Landslides - Slump in the Berkeley Hills, California
Rotational earth slide in the gallery of landslide photos. Page 8.

Landslides - Hillside Strengthening with Concrete Pillars
A hillside slump uncovers concrete pillars placed to strengthen the soil. Page 29.

Landslides - Berkeley Hills Slides and Mitigation
Small slides in Berkeley hillside with riprap. Page 30.

Landslides
Gallery of landslide photos

Landslides
Gallery of landslide photos

Landslides
Gallery of landslide photos

Landslides - Lahar in Colombia, 1994
Lahars in Colombia's volcanic region, 1994. Page 20.

Landslides - Panoche Hills Slump
Multiple slumps in the Panoche Hills, central California. Page 10.

Landslides - Del Puerto Canyon Slumps
Slumps and debris flows in Del Puerto Canyon, California. Page 11.

Landslides - Roadbuilding on a Slide
Mitigating landslide effects can involved creative structural design. Page 33.

Landslide Mitigation - Draining a Landslide
Draining water from landslides is a common mitigation technique. Page 31.

Landslides - Tully Valley Landslide, New York
The Tully Valley landslide of 1993 near Syracuse, New York. Page 14.

Amphibole Minerals - Hornblende Schist
Hornblende schist in the gallery of amphibole minerals. Page 4.

Amphibole Minerals - Glaucophane, Jenner, California
Glaucophane in the gallery of amphibole minerals. Page 9.

Amphibole Minerals - Hornblende with Alteration
Hornblende with alteration rinds, in the gallery of amphibole minerals. Page 3.

Amphibole Minerals - Actinolite in Eclogite
Actinolite vein in eclogite, in the gallery of amphibole minerals. Page 8.

Amphibole Minerals - Actinolite
Actinolite is a major amphibole mineral. Page 5.

Amphibole Minerals - Actinolite Closeup
Closeup of actinolite in the gallery of amphibole minerals. Page 7.

Amphibole Minerals - Actinolite, Northern California
Actinolite in the gallery of amphibole minerals. Page 6.

Albany Bulb: Geo-Photos from the San Francisco Bay Area 1
The Albany Bulb, an artistic human landform, San Francisco Bay area, California. Page 2.

Earth Art Gallery - Office Building Wall Inspired by Zen Garden
The wall of a Silicon Valley office building takes inspiration from the Japanese rock garden. Page 25.

Earth Art Gallery - Earthquake Art Installation at Parkfield, California
This temporary work expressed the seismic activity of a whole state. Page 14.

Earth Art Gallery - Petroglyphs
Petroglyphs of the American Southwest qualify as Earth art. Page 3.

Earth Art Gallery - Stone Flower by Richard Botto
The stone flowers and mushrooms created by Richard Botto are Earth art. Page 10.

Honoring a Former Mine with a Joshua Tree Sculpture - Earth Art Gallery
A former mine site is decorated with a metal Joshua Tree near Ridgecrest, California. Page 11.

Earth Art Gallery - Mountain Stone Suiseki by Lance Plaza
Mountain stone-type suiseki by Lance Plaza, in the Earth art photo gallery. Page 23.

Earth Art Gallery - Japanese Rock Garden
The Japanese rock garden is an instructive example for scientists. Page 24.

Earth Art Gallery - Gongshi or Chinese Scholar Stones
A gongshi or scholar's stone from China in the Earth art photo gallery. Page 19.

Earth Art Gallery - Vernacular Earth Art, Panoche Hills, California
Gypsum city, Panoche Hills, in the Earth art photo gallery. Page 16.

Earth Art Gallery - Penjing, Chinese Landscape Stones
Penjing, the ancient Chinese art of stone landscapes, in the Earth art photo gallery. Page 18.

Earth Art Gallery - Creation Myth by Jesse Reichek
Creation myth interpreted by Jesse Reichek, in the Earth art photo gallery. Page 2.

Earth Art Gallery - Roadside Shotcrete Sculpture
Road projects hire sculptors to make shotcrete look like stone. Page 12.

Earth Art Gallery - Vernacular Art on Stinson Beach
Earth art photo gallery. Geology. Page 5.

Earth Art Gallery - Stone River by Andy Goldsworthy
Stone River by Andy Goldsworthy, in the Earth art photo gallery. Page 6.

Earth Art Gallery - Stone River by Andy Goldsworthy
Stone River by Andy Goldsworthy, in the Earth art photo gallery. Page 8.

Earth Art Gallery - Stone River by Andy Goldsworthy
Stone River by Andy Goldsworthy, in the Earth art photo gallery. Page 9.

Earth Art Gallery - Stone River by Andy Goldsworthy
Stone River by Andy Goldsworthy, in the Earth art photo gallery. Page 7.

Earth Art Gallery - Abstract Suiseki
Abstract suiseki by Jim Broadhurst, in the Earth art photo gallery. Page 22.

Earth Art Gallery - Brown Suiseki
A brown suiseki stone, in the Earth art photo gallery. Page 20.

Earth Art Gallery - Green Mountain Suiseki
Green mountain suiseki stone, in the Earth art photo gallery. Page 21.

Earth Art Gallery - The Globe as Art
Earth itself becomes art in San Francisco's Yerba Buena Gardens. Page 26.

Earth Art Gallery
Earth art photo gallery.

Earth Art Gallery
Earth art photo gallery.

Slickensides or Fault Mirrors - Slickenside Pictures
A gallery of photos showing slickensides, fault-polished rock surfaces.

Slickensides or Fault Mirrors - Slickenside Pictures
A gallery of photos showing slickensides, fault-polished rock surfaces.

Fulgurite Pictures
Selected photos of these bits of

Geologic Photography Tips - The Magic Hour, Sunset or Sunrise
Good pictures come like magic at dawn and dusk.

Fossils of Triceratops Trail, Golden Colorado - Fossil Trace Golf Course
Dinosaur tracks and other fine fossils are preserved alongside a new golf course.

White and Black Streak Plates
Streak plates come in white and black.

Cone Penetrometer Testing or CPT - Truck-Mounted CPT Rig
This heavy truck is carrying out CPT work near an earthquake fault.

Ground-Penetrating Radar - Laying Out the Line
A line is laid out for a ground-penetrating radar pass.

Lakeview Oil Gusher - The Gusher in Progress
Contemporary postcard showing America's most spectacular oil gusher in 1910.

Fulgurite Pictures - Sand Fulgurite
Moroccan sand fulgurite with a penny for scale.

Mud Volcanoes - Sand Volcano or Sand Blow
Sand volcanoes or sand blows are one of the four basic types of mud volcano.

Earth Art Gallery - Creation Myth by Jesse Reichek
Creation myth interpreted by Jesse Reichek, in the Earth art photo gallery.

Introducing Travertine - Travertine Picture Gallery
Introducing this rock type with a rugged boulder.

Obsidian Picture Gallery - Obsidian Flow
Big Obsidian Flow in Newberry Caldera, Oregon.

Earthquake Engineering - Moscone Center West, San Francisco
Moscone Center West is designed and built to an extra-high standard of quake resistance.

Studying Fault Zones with Trenches - Paleoseismic Trench on the Green Valley Fault
Scene of a trenching study on the Green Valley fault near Fairfield, California.

Massive Basalt - Volcanic Rocks
Photo of massive basalt. Geology.

Granite Photo Gallery - Blocks of Granite
Granite characteristically weathers in large blocks.

Fossil Wood Gallery - Petrified Wood, Sonoma County California, Pliocene
Fossilized wood from Sonoma County's Petrified Forest.

1906 San Francisco Earthquake Landmarks Today - The Old Mint
Structures surviving from the 1906 San Francisco earthquake and fires.

Geologists' Pet Rocks and Favorite Stones - Fractured Mudstone
A multiply fractured mudstone, one of my pet rocks.

Storing Rocks - The Situation with Rocks
Rocks inevitably come to fill the space allotted them.

The Zeolite Minerals
A cryptic and important group of low-temperature minerals.

Geologic Photography Tips
Some of the things I do to take good pictures.

Geologic Photography Tips
Some of the things I do to take good pictures.

Shell Beach, California - A Showplace of Franciscan Rocks
Shell Beach, on the Sonoma County coast north of San Francisco, is a remarkable showplace of the subduction-related rocks of the Franciscan Complex.

Shell Beach, California - A Showplace of Franciscan Rocks
Shell Beach, on the Sonoma County coast north of San Francisco, is a remarkable showplace of the subduction-related rocks of the Franciscan Complex.

Dinosaur Ridge, Morrison, Colorado
Photos from Dinosaur Ridge National Natural Landmark near Denver, Colorado.

Fossil Fuels Photo Essay
A picture survey of the seven major fossil fuels.

Fossil Fuels Photo Essay
A picture survey of the seven major fossil fuels.

Fossil Fuels Photo Essay
A picture survey of the seven major fossil fuels.

Identifying Minerals by Streak Tests
About this simple but effective field technique for mineral identification.

Lakeview Oil Gusher - Greatest Oil Gusher of Them All
Visit the site of America's most spectacular oil gusher a hundred years later.

Official State Rocks and State Stones of the United States
Twenty-five states have honored 17 different state rocks or state stones. Here they are.

Official State Rocks and State Stones of the United States
Twenty-five states have honored 17 different state rocks or state stones. Here they are.

Mud Volcanoes
A gallery of the four basic types of mud volcano.

Concretions Picture Gallery
Concretions are cemented bodies of sediment that tend to erode free.

Concretions Picture Gallery
Concretions are cemented bodies of sediment that tend to erode free.

Conglomerate Picture Gallery
An assortment of conglomerates.

Conglomerate Picture Gallery
An assortment of conglomerates.

Basalt Picture Gallery
A selection of annotated photos of basalt.

Basalt Picture Gallery
A selection of annotated photos of basalt.

Igneous Rock Classification Diagrams
Diagrams showing IUGS classification of phaneritic and aphanitic igneous rocks.

Granite Gallery - Photos of Granitic Rocks
Photos of various granites and granitic rocks

Phenocrysts and Their Host Rocks - Photo Gallery
Phenocrysts are distinctly large crystals in an igneous rock. Here are pictures of some of the minerals that form phenocrysts.

Fossil Wood Gallery - Pictures of Petrified Wood
Examples of fossilized wood.

Geologists' Pet Rocks and Favorite Stones
The stones we can't put away.

Storing Rocks
Simple ways to keep your rocks organized and clean.

Pillow Lava Gallery
Pillow lavas from the present to the Ordovician.

Geodes Gallery
Picture gallery and explanation of these curious features.

Outcrops versus Exposures, an Essay
When is an exposure really an outcrop, or vice versa?

Walking Zero, Discovering Cosmic Space and Time along the Prime Meridian by Chet Raymo
A charming and insightful treatment of the scientific worldview based on a stroll along England's Prime Meridian

What's a Good Geology Textbook
Textbook advice for the intelligent lay reader.

Do Magnetic Reversals Affect Migrating Animals?
Migrating animals like birds survive geomagnetic reversals, so they can't be that deadly.

What Is Commercial Granite?
The granites of geology and commerce are quite different.

Location for Geologists - The Township and Range System
What geologists need to know about townships, ranges and the Public Land Survey System.

Origin of the Land Grid - About the Township and Range System
What geologists need to know about townships, ranges and the Public Land Survey System.

Berlin-Ichthyosaur State Park - Nevada Geological Attractions and Destinations
Berlin-Ichthyosaur State Park is one of Nevada's geological attractions.

Geology of Glenwood Springs, Colorado
Geological highlights of the Glenwood Springs, Colorado area.

Nevada Geological Attractions and Destinations
A growing set of Nevada's geological attractions.

Nevada Geological Attractions and Destinations
A growing set of Nevada's geological attractions.

Artists Point - Minnesota Geological Attractions and Destinations
Artists Point is one of Minnesota's geological attractions.

Minnesota Geological Attractions and Destinations
A growing selection of Minnesota's geological attractions.

Colorado's Mineral Wealth - Colorado Geological Attractions and Destinations
Introducing the geological highlights of Colorado.

Colorado Geological Attractions and Destinations
A brief primer of the geological highlights of Colorado.

Amnicon Falls - Wisconsin Geological Attractions and Destinations
Amnicon Falls is one of Wisconsin's geological attractions.

Wisconsin Geological Attractions and Destinations
A growing set of Wisconsin's geological attractions.

Ammonoids - Fossil Picture Gallery
Miniature ammonoid fossil, emblem of the Cretaceous.

Fossil Picture Gallery
Pictures of fossils, part of the About.com Geology gallery of images.

Fossil Picture Gallery
Pictures of fossils, part of the About.com Geology gallery of images.

Amber - Mineraloid Substances
Amber is one of the mineraloids.

Karst Karrenfeld of Columbia, California
A large karstland is preserved in the California gold country.

Isle Royale - Michigan Geological Attractions and Destinations
Isle Royale is one of Michigan's geological attractions.

Chain O' Lakes - Indiana Geological Attractions and Destinations
Chain O' Lakes is one of Indiana's geological attractions.

Apple River Canyon State Park - Illinois Geological Attractions and Destinations
Apple River Canyon State Park is one of the geological attractions of Illinois.

Camelback Mountain, Phoenix - Arizona Geological Attractions and Destinations
Camelback Mountain, Phoenix, is one of Arizona's geological attractions.

Arizona Geological Attractions and Destinations
A selection of Arizona's many geologic attractions.

Georgia Geological Attractions and Destinations
A selection of Georgia's geological attractions.

Brasstown Bald - Georgia Geological Attractions and Destinations
Brasstown Bald is one of Georgia's geological attractions.

Georgia Geological Attractions and Destinations
A selection of Georgia's geological attractions.

Sulfide Minerals
is one of the sulfide minerals.

The Pyroxene Minerals
The pyroxene minerals are major parts of the crust and mantle.

Evaporite Minerals and Halides
Introducing the halides and evaporite minerals.

Aragonite - Carbonate Minerals
Aragonite is one of the carbonate minerals.

Diamond - Native Element Minerals
Diamond is a rare form of carbon, the element C, in native form.

Sulfate Minerals
Sulfate minerals form near the Earth's surface.

Native Element Minerals
Notable elements that are found in nature in native form.

The Garnet Minerals
Major members of the garnet group of minerals.

Almandine Garnet
Almandine is one of the garnet minerals.

Phosphate Minerals
Minerals that include this important element.

Rock-Forming Minerals - Amphibole - Hornblende
Amphibole is classed as a rock-forming mineral.

Washington State Geological Attractions and Destinations
A pictorial selection of Washington state's geologic attractions.

Geology of San Francisco, California
A photo tour of San Francisco's geologic attractions.

Geology of San Francisco, California
A photo tour of San Francisco's geologic attractions.

Geology of San Francisco, California - The Golden Gate and San Francisco
The Golden Gate is one of San Francisco's geologic attractions.

The Polished Stone of Mammoth Rocks, Sonoma County, California
Scenes and two theories from the Mammoth Rocks site in Sonoma County, California.

Geology of the Las Vegas Region - The Setting of Las Vegas
Las Vegas is surrounded with mountains.

Coso Geothermal Field, California - Mudpot Portrait
A visit to the Coso geothermal field is an exhilarating experience.

Geology of Golden, Colorado
Geologic highlights of the Golden area, west of Denver.

Upper Las Vegas Wash, Nevada
A photo tour of this important site for Pleistocene paleontology.

Valley of Fire State Park, Nevada
Red rocks of the Aztec Sandstone are the highlight of this spectacular desert park northeast of Las Vegas.

The Hayward Fault in Hayward
The Hayward fault in its type locality.

Geology of the Sutter Buttes, California
Pictures, maps and notes from the Sutter Buttes of central California, 'the world's smallest mountain range.'

Geology of the Sutter Buttes, California
Pictures, maps and notes from the Sutter Buttes of central California, 'the world's smallest mountain range.'

Geology of the Sutter Buttes, California
Pictures, maps and notes from the Sutter Buttes of central California, 'the world's smallest mountain range.'

Northern San Andreas Fault
The San Andreas fault from its northern end down to San Juan Bautista, all of which ruptured in 1906.

Northern San Andreas Fault
The San Andreas fault from its northern end down to San Juan Bautista, all of which ruptured in 1906.

Northern San Andreas Fault
The San Andreas fault from its northern end down to San Juan Bautista, all of which ruptured in 1906.

Northern San Andreas Fault
The San Andreas fault from its northern end down to San Juan Bautista, all of which ruptured in 1906.

Creeping Segment of the San Andreas Fault
Photos and notes on the creeping segment of the San Andreas fault from Hollister to the Cholame Valley, central California.

The San Andreas Fault at Parkfield
Photos and notes from the San Andreas fault segment centered on Parkfield, California.

The San Andreas Fault at Parkfield
Photos and notes from the San Andreas fault segment centered on Parkfield, California.

Creeping Segment of the San Andreas Fault
Photos and notes on the creeping segment of the San Andreas fault from Hollister to the Cholame Valley, central California.

Southern San Andreas Fault
A photo tour of the southern San Andreas fault between the Salton Sea and Cajon Pass.

Southern San Andreas Fault
A photo tour of the southern San Andreas fault between the Salton Sea and Cajon Pass.

Salton Sea Seep Field
Photos of wild geothermal activity in southern California.

Salton Sea Seep Field - The Seep Field
Setting of the Davis-Schrimpf seep field.

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

Landslides - Parts of a Landslide
Diagram of the parts of a landslide, in the gallery of landslide photos

Different Kinds of Quartz
Three different varieties of quartz in spherical form.

Quartz and Silica Minerals Picture Gallery
Get familiar with quartz.

Quartz and Silica Minerals Picture Gallery
Get familiar with quartz.

Cryptocrystalline Quartz (Chalcedony) in Chert
A fractured chert pebble displays silica in its cryptocrystalline form.

Amphibole Minerals - Hornblende Picture
Hornblende in the gallery of amphibole minerals.

Acicular Mineral Habit
Acicular minerals take needlelike forms.

Mineral Habits
The various forms that minerals take in rocks.

Mineral Habits
The various forms that minerals take in rocks.

Amphibole Minerals - Picture Gallery of Amphiboles
Gallery of amphibole minerals.

Oregon Outback Pictures
The Oregon Outback may be the prettiest part of the Basin and Range.

Geological Photos from the San Francisco Bay Area
Geological photo tour of the San Francisco Bay area, California

Texas Geological Attractions and Destinations
A selection of Texas' geological attractions.

Abert Rim - Oregon Geological Attractions and Destinations
Abert Rim is one of Oregon's geological highlights.

Oregon Geological Attractions and Destinations
Some of Oregon's geological highlights.

Oregon Geological Attractions and Destinations
Some of Oregon's geological highlights.

Cameron and Mark Twain Caves - Missouri Geological Attractions and Destinations
Cameron and Mark Twain Caves are one of Missouri's geological attractions.

Washington DC Geology - Capitol Dome and Botanic Garden
Buildings are a major part of the geology of Washington, DC.

Geology of the Algodones Dunes, California
Pictures of California's largest dunefield, the Algodones Dunes.

Kelso Dunes, Mojave Desert, California - Welcome to the Kelso Dunes
The Kelso Dunes and adjoining Devil's Playground are human playgrounds too.

Geology of the California Coast
A survey of California's coastal geologic attractions, from north to south.

Geology of the California Coast
A survey of California's coastal geologic attractions, from north to south.

Geology of the California Coast
A survey of California's coastal geologic attractions, from north to south.

Measuring Fault Displacement with Piercing Points
Rocks at Point Lobos and Point Reyes, now 180 km apart, were once one body.

Measuring Fault Displacement with Piercing Points
Rocks at Point Lobos and Point Reyes, now 180 km apart, were once one body.

Coso Geothermal Field, California - Boiling Spring
Boiling spring in the Coso geothermal field.

Plagioclase in Anorthosite - Gallery of Feldspars
Plagioclase is well displayed in a gravestone.

Gallery of Feldspars
Picture gallery of the feldspar minerals.

Gallery of Artificial Rocks
Bricks, mortar, concrete, plaster and other artificial rocks.

Gallery of Artificial Rocks
Bricks, mortar, concrete, plaster and other artificial rocks.

Mica Minerals - Pictures of Micas
The micas include several notable mineral species.

Biotite - Mica Minerals
Biotite is an iron-rich member of the mica minerals.

State Gemstones of the United States
The 27 official gemstones of 35 states.

State Gemstones of the United States
The 27 official gemstones of 35 states.

State Gemstones of the United States
The 27 official gemstones of 35 states.

The Silicate Minerals
The great majority of rocks are made of silicate minerals.

The Silicate Minerals
The great majority of rocks are made of silicate minerals.

Sedimentary Rock Classification Diagrams - Ternary Diagrams
Diagrams to help classify sedimentary rocks.

Barton Garnet Mine - New York Geological Attractions and Destinations
The Barton Garnet Mine in the Adirondack Mountains is one of New York state's geological attractions.

New York Geological Attractions and Destinations
A set of New York state's geological attractions.

New York Geological Attractions and Destinations
A set of New York state's geological attractions.

SAFOD - San Andreas Fault Observatory at Depth
Pictures from this history-making drilling project into an active earthquake fault.

SAFOD - San Andreas Fault Observatory at Depth
Pictures from this history-making drilling project into an active earthquake fault.

Organic (Biological) Weathering Defined and Explained
A short explanation of organic or biological weathering.

Phyllite - Slabs of Phyllite in a Stone Yard
Slabs of phyllite are sold under the name slate by stone dealers.

Phyllite - Pictures and Information About Phyllite
Phyllite is between slate and schist in the spectrum of metamorphic rocks.

Serpentinite Gallery
A gallery of these interesting, important and sexy rocks.

Serpentinite Gallery
A gallery of these interesting, important and sexy rocks.

Slate - All About Slate
Slate is a widely used low-grade metamorphic rock.

Lava Dome - Volcano Types
Sugarloaf Mountain is a lava dome in the Coso volcanic field of eastern California.

Wave-Cut Platforms
Wave-cut platforms are created by nearshore erosion.

Tombolo at Shiaram Mhor, Isle of Lewis, Scotland
Tombolo at Shiaram Mhor, Outer Hebrides.

Types of Volcanoes
The major volcano types found on land.

Types of Volcanoes
The major volcano types found on land.

Fossil Wave-Cut Platform, Point Ano Nuevo, California - Wave-Cut Platforms
Surface of an ancient wave-cut platform exposed by modern erosion.

How Many Plates Are There, Not an Easy Question
Teachers want one right answer to this question, but there isn't one.

Ophiolitic Rocks Photo Gallery
Rocks and outcrops that display the parts of a typical ophiolite.

Ophiolitic Rocks Photo Gallery
Rocks and outcrops that display the parts of a typical ophiolite.

Pelagic Sedimentary Rocks, Marin County - Ophiolitic Rocks Photo Gallery
Pelagic rocks like chert are part of a typical ophiolite.

Ball-and-Pillow Structure, California - Pictures of Sedimentary Structures
Ball-and-pillow structures in a sedimentary rock exposure.

The Basic Unconformity Types - Unconformity Types and Examples
Diagrams of the main unconformity types.

Unconformity Types and Examples
Diagrams and photos of different unconformity types.

Pictures of Sedimentary Structures
Signs of geologic history in sedimentary rocks.

Pictures of Sedimentary Structures
Signs of geologic history in sedimentary rocks.

Hydrothermal Features Gallery
Photos and definitions of hydrothermal features.

Hydrothermal Features Gallery
Photos and definitions of hydrothermal features.

Lester Park Stromatolites, New York
Stromatolites from Lester Park locality, Saratoga Springs, New York.

Ship Rock, Colorado - Stereoscopic Images
Visualize Ship Rock at Red Rocks State Park in three dimensions with photo stereopairs.

Seismic Refraction Method
How a seismic refraction line is prepared and recorded.

Seismic Data Collection Center - Seismic Refraction Method
Data from a seismic refraction line is collected in the field on a laptop.

Balance Rock - Massachusetts Geological Attractions and Destinations - Massachusetts Geology
Balance Rock is one of Massachusetts' geological attractions.

Limestones - Roadcut on New York Route 20
Limestone is exposed in a New York roadcut.

Limestones
Examples of limestone and its features.

Minerals with Metallic Luster - Sphalerite
Sphalerite, in the gallery of minerals with metallic luster.

Sedimentary Rock Types - Pictures and Descriptions
The major types of sedimentary rocks.

Oil Seep at McKittrick, California - Seep Sign
Chevron marks the spot of the McKittrick oil seep.

Bornite - Minerals with Metallic Luster
Bornite, in the gallery of metallic minerals.

Amphibole (Hornblende) Picture - The Silicate Minerals
Amphibole is a group of the silicate minerals.

Cassiterite - Oxide Minerals
Cassiterite is one of the oxide minerals.

Oxide Minerals
A varied mineral group with simple formulas.

The Silicate Minerals
The great majority of rocks are made of silicate minerals.

Escarpment, Oregon - Tectonic Landforms
The largest escarpments are tectonic landforms.

Alluvial Fan, California - Depositional Landform Pictures
Alluvial fans are a type of depositional landform.

Arch - Erosional Landforms
Arches are a type of erosional landform.

Abrasion - Mechanical or Physical Weathering Gallery
The grinding process that wears down river and beach rocks.

Basalt Weathering Rind - Chemical Weathering Gallery
A lava cobble shows layers of alteration from chemical weathering.

Metamorphic Pebble - Metamorphic Rock Gallery
A multicolored metamorphic pebble.

Poison Plants - Devil's Club, Oplopanax horridus
Geologists and rockhounds alike need to be aware of these hazardous plants in the field.

Tectonic Landforms
Common types of tectonic landforms.

Metamorphic Rock Gallery - Metasedimentary and Metaigneous Rocks
A spectrum of metamorphic rocks, the pelitic sequence and the basaltic sequence.

Metamorphic Rock Gallery - Metasedimentary and Metaigneous Rocks
A spectrum of metamorphic rocks, the pelitic sequence and the basaltic sequence.

Metamorphic Rock Gallery - Metasedimentary and Metaigneous Rocks
A spectrum of metamorphic rocks, the pelitic sequence and the basaltic sequence.

Sedimentary Rock Gallery
An assortment of sedimentary rocks, from fine to coarse grained.

Depositional Landform Pictures
A photo dictionary of depositional landforms.

Depositional Landform Pictures
A photo dictionary of depositional landforms.

Erosional Landform Pictures
A gallery of erosional landform types.

Erosional Landform Pictures
A gallery of erosional landform types.

Erosional Landform Pictures
A gallery of erosional landform types.

Chemical Weathering Gallery
Processes that turn primary minerals into surface minerals or dissolved ions.

Mechanical or Physical Weathering Gallery
Processes that turn big particles into smaller particles.

Volcanic Rocks - Extrusive Igneous Rocks
Photos of the types of erupted igneous rocks.

Volcanic Rocks - Extrusive Igneous Rocks
Photos of the types of erupted igneous rocks.

Volcanic Rocks - Extrusive Igneous Rocks
Photos of the types of erupted igneous rocks.

Igneous Rock Textures
The major texture types found in igneous rocks.

Sedimentary Rock Gallery
An assortment of sedimentary rocks, from fine to coarse grained.

Hazardous Plants Gallery
Geologists and rockhounds alike need to be aware of these hazardous plants in the field.

Hazardous Plants Gallery
Geologists and rockhounds alike need to be aware of these hazardous plants in the field.

Gallery of Meteorites
Photo gallery of various meteorites

Pictures of Geologic Features and Processes
Pictures of geologic features and the processes of geology.

Archbald Pothole - Pennsylvania Geological Attractions and Destinations
Archbald Pothole is one of Pennsylvania's geological attractions.

Ohio Geological Attractions and Destinations
A selection of Ohio's geological attractions.

Metamorphic Rock Types - Pictures and Descriptions
The major metamorphic rock types, from regional, contact and mechanical metamorphism.

Metamorphic Rock Types - Pictures and Descriptions
The major metamorphic rock types, from regional, contact and mechanical metamorphism.

1857 Earthquake Segment of the San Andreas Fault - Index Map
Index map of the central San Andreas fault, which ruptured in the great 1857 California earthquake.

1857 Earthquake Segment of the San Andreas Fault
Photos and notes from the central San Andreas fault, which ruptured in the great 1857 California earthquake.

1857 Earthquake Segment of the San Andreas Fault
Photos and notes from the central San Andreas fault, which ruptured in the great 1857 California earthquake.

1857 Earthquake Segment of the San Andreas Fault
Photos and notes from the central San Andreas fault, which ruptured in the great 1857 California earthquake.

1857 Earthquake Segment of the San Andreas Fault
Photos and notes from the central San Andreas fault, which ruptured in the great 1857 California earthquake.

1857 Earthquake Segment of the San Andreas Fault
Photos and notes from the central San Andreas fault, which ruptured in the great 1857 California earthquake.

Minerals with Metallic Luster - Galena Specimen
Galena specimen, in the gallery of minerals with metallic luster.

Transportation (Geology) Defined and Explained
A short explanation of transportation, part of erosion.

Corrosion (Geology) Defined and Explained
A short explanation of corrosion or chemical erosion.

Corrasion Defined and Explained
A short explanation of corrasion or mechanical erosion.

Bioturbation Defined and Explained
A short explanation of bioturbation.

Alteration (Geology) Defined and Explained
A short explanation of alteration.

Tourmaline Picture - The Silicate Minerals
Tourmaline is one of the silicate minerals.

Geology Wallpaper - Oregon Outback - Abert Rim 2 - 1280x1024
Abert Rim view number 2, from the Oregon Outback collection of geologic wallpaper images on About.com.

Geology Wallpaper - Rock Closeups - Chert Breccia 2, 800x600
Chert breccia number 2, 800x600, from the Rock Closeups collection of geologic wallpaper images on About.com.

Geology Wallpaper - Rock Closeups - Garnet Schist, 1280x1024
Garnet Schist, 1280x1024, from the Rock Closeups collection of geologic wallpaper images on About.com.

Sand: The Never-Ending Story by Michael Welland
Michael Welland makes the subject of sand his base station for a journey around the whole earth system and beyond.

Sedimentary Rock Gallery - Franciscan Conglomerate, Jenner, California
Franciscan conglomerate, from the gallery of sedimentary rocks.

Sedimentary Rock Gallery - Conglomerate, Peachtree Valley
A tough conglomerate near the San Andreas fault.

Sedimentary Rock Gallery - Conglomerate Boulder
A conglomerate boulder in a Nevada wash.

Sedimentary Rock Gallery - Pebble Conglomerate
Pebble conglomerate from south of Fort Ross, California.

Climate Change, Ocean Science and Atmospheric Science
About climate change from the geological viewpoint, along with the science of the ocean and atmosphere.

Missouri Geology
All sorts of content about Missouri geology: its rocks, landforms and deep history.

South Carolina Geology
All sorts of content about South Carolina geology: its rocks, landforms and deep history.

Mineralogy
Scientific aspects of minerals.

Sedimentary Rock Gallery - Conglomerate, Griswold Canyon
Conglomerate of indistinct sandstone cobbles, Griswold Canyon, Diablo Range.

Sedimentary Rock Gallery - Conglomerate, Tumey Hills, California
A spectacularly diverse conglomerate from the Tumey Hills in the Coast Range.

Geology News, Blogs and Books


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