Earth Science

Castle Geyser, Yellowstone National Park

Mount Ngauruhoe Volcano, North Island, New Zealand]

Strokkur Geyser, Iceland

Skjaldbreidur basaltic shield volcano, northeast of Thingvelir, Iceland, aerial

Tephra stratigraphy, Iceland

Sunglacial pillow lava, Iceland

Tongue of lava, East Rift, Hawaii

Lava tube window, East Rift, Hawaii, aerial

Lava meets the ocean, East Rift, Hawaii

Pahoehoe lava, East Rift, Hawaii

MacDougal Crater, Pinacate Volcanic Field, northwestern Sonora, Mexico, aerial

Shiprock volcanic neck & radial dike, New Mexico, aerial

Shiprock volcanic neck & radial dike, New Mexico, aerial

Volcanic neck & dike near Kayenta, Arizona, aerial

Volcans Throne & lava falls, Grand Canyon, Arizona, aerial

SP cinder cone & lava flow near Flagstaff, Arizona, aerial

Pompeii Street with Vesuvius Volcano on skyline, Italy

Modern nautilus shell in cross-section showing chambers

Suture pattern, ammonite fossil, Sphenodiscus lenticularis, Cretaceous, Fox Hills, S. Dakota

Leaf fossil, Permain age, Gondwanaland Glossopteris Flora, Dunedoo, Australia

Cruziana, trace fossil, trilobite feeding tracks, Bright Angel Shale, Grand Canyon, AZ

Brachipod fossil, Kaibab Limestone, Permian Age, Grand Canyon, AZ

Meekella brachipod fossil, Kaibab Limestone, Permian Age, Grand Canyon, AZ

Branched coral fossil, Kaibab Limestone, Permian Age, Grand Canyon, AZ

Sponge fossil, Kaibab Limestone, Permian Age, Grand Canyon, AZ

Dinosaur tracks, Jurassic Moenave Formation, northern Arizona

Fossil bird tracks, Eocene Age Green River Formation, Utah

Pine cone fossil, Araucaria mirabillis, Jurassic Age, Patagonia, Argentina

Fossil oyster beds, Cretaceous Dakato Sandstone, southern Utah

Bird's nest calcite, Campbell Shaft, Bisbee, AZ

Dolomite on aragonite, 7th level Southwest Mine, Bisbee, AZ

Octohedral diamond crystal in kimberlite, 0.4 carat, Russia

Shatter cones from a meteorite impact site

Upheaval Dome impact crater, Canyonlands, Utah, aerial

K/T boundary layer clay discovery site, Gubbio, Italy

Growth rings in petrified wood

Petrified wood, Arizona

Mud curls, ephemeral stream channel, San Rafael Swell, Utah

Fossil salt crystal casts, Triassic Age Moenkopi Formation, northern Arizona

Modern raindrop imprints in mud, northern Arizona

Cross-bedded Permian Age aeolian DeChelly Sandstone, northern Arizona

Cross-bedded Navajo Sandstone, Paria Plateau, AZ

Tapeats Sandstone on Vishnu Schist, Great Unconformity, Grand Canyon, AZ

Tapeats Sandstone on Vishnu Schist, Great Unconformity, Grand Canyon, AZ

Brachiopod fossil, Raplee Anticline, southern Utah

Coral head fossils, Late Paleozoic Age, San Juan River, southern Utah

Oregon Inlet & Pea Island, Outer Banks, North Carolina, aerial

Bodie Island Lighthouse, Outer Banks, North Carolina, aerial

Interdunal mud flat with mud cracks, Death Valley, California

Fossil mud cracks, Proterozoic Age Unkar Group, Grand Canyon, AZ

Fossil mud cracks, Proterozoic Age, Dripping Spring Quartzite, Sierra Anchas, AZ

Fossil flat topped ripple marks, Cambrian Age Tapeats Sandstone, Grand Canyon, AZ

Bioturbation, fossil burrows, Cambrian Age Bright Angel Shale, Grand Canyon, AZ

Fossil burrows, Proterozoic Age Unkar Group, Grand Canyon, AZ

Tube worm burrows, Cambrian Age Tapeats Sandstone, Grand Canyon, AZ

Mud curls, ephemeral stream, Arizona

Mud curls, Chinle Formation, Painted Desert, Arizona

Bank erosion, Rillito Creek near Prince Road, 1983 flood, Tucson, Arizona

Bank erosion, Rillito Creek near Prince Road, 1983 flood, Tucson, Arizona, aerial

Angular Unconformity, Grand Canyon, AZ

Hill of Vishnu Schist covered by Tapeats Sandstone, Grand Canyon, AZ

Unconformity, Siccar Point, Berwickshire, Scotland, UK

Jointed sandstone & fins, Devil's Garden, Arches, Moab, Utah. aerial

Cockcomb, Kaibab Monocline, Cottonwood Canyon, southern Utah

Saint Peters Sandstone x25, Ordovician Age orthoquartzite

Thunder River Springs, Tapeats Creek, Grand Canyon, AZ

Boulder channel of Oak Canyon, Glen Canyon, southern Utah

Baby Rocks, Blue Mesa, northern Arizona

Hoodoos, Goblin Valley, southern Utah

Sandstone boulders on pedestals of Tropic Shale, Warm Creek, Utah

Bank erosion, Rillito Creek @ Dodge Road, 1983 flood, Tucson, Arizona, aerial

Bank erosion, Rillito Creek @ Dodge Road, 1983 flood, Tucson, Arizona,

Bank erosion, Rillito Creek @ First Avenue, 1983 flood, Tucson, Arizona

Bank erosion, Rillito Creek @ First Avenue, 1983 flood, Tucson, Arizona, aerial

Bank erosion, Rillito Creek @ First Avenue, 1983 flood, Tucson, Arizona

Bank erosion, Rillito Creek near Prince Road, 1983 flood, Tucson, Arizona, aerial

Bank erosion, Rillito Creek near Prince Road, 1983 flood, Tucson, Arizona

Soil cemented bank of Rillito Creek, 1993, Tucson, Arizona, aerial

San Pedro River channel after October, 1983, flood, north of Mammoth, AZ, aerial

Parker Dam & CAP takeout, Lake Havasu, western Arizona, aerial

Entrenched meanders, Goosenecks, San Juan River, Mexican Hat, Utah, aerial

Temple of Serapis impacted by bradyseism, Pozzuoli, Naples, Italy

Felsic dikes in Vishnu Schist, Grand Canyon, AZ

Proterozoic Age diabase dike cuts Hakati Shale, Grand Canyon, AZ

Proterozoic Age diabase sill & associated contact metamorphism, Grand Canyon, AZ

Mafic sills intruding Mesozoic sediments, Capitol Reef National Park, Utah

Sunset crater cinder cone & lava flow, Flagstaff, AZ, aerial

Sunset crater cinder cone & lava flow, Flagstaff, AZ, aerial

Sunset crater cinder cone, San Francisco Volcanic Field, Flagstaff, AZ, aerial

Columnar jointed basalt, Whitmore Wash, Grand Canyon, AZ

Agathla Peak, volcanic neck, Kayenta, Arizona, aerial

Church Rock, volcanic neck, Kayenta, Arizona

SP Cinder Cone, lava flow & Mesa Butte Fault scarp, northern Arizona, aerial

SP Cinder Cone & lava flow, northern Arizona, aerial

Strawberry crater, cinder cone & lava flow, Flagstaff, AZ, aerial

Annapurna Himal from Mustang Trail, Nepal

Annapurna Himal from Mustang Trail, Nepal

Folded sedimentary layers, Kagbeni, Kali Gandaki Gorge, Nepal

Himalayan Peaks from Mustang Trail, Nepal

Kali Gandaki River channel, Nepal

Kali Gandaki River channel, Nepal

Annapurna Himal from Mustang Trail, Nepal

Deformed rocks, Kali Gandaki Gorge, Nepal

Deformed rocks, Kali Gandaki Gorge, Nepal

Elegante maar crater tuff ring, Pinacate Volcanic Field, NW Sonora, Mexico

Elegante maar crater, Pinacate Volcanic Field, NW Sonora, Mexico

Lava flows & cinder cones, Pinacate Volcanic Field, NW Sonora, Mexico, aerial

Lava flows & cinder cones, Pinacate Volcanic Field, NW Sonora, Mexico, aerial

Lava flow off Pinacate Peaks, NW Sonora, Mexico, aerial

Nilgiri Peak (7051m), Annapurna Himal, Nepal

Octohedral Diamond Crystal, one carrot, South Africa

Ammonite Fossil, Morocco

Ammonite Fossil, Morocco

Ammonite fossil, Kali Gandaki Gorge, Nepal

Ammonite fossil, Kali Gandaki Gorge, Nepal

McCarty tidewater glacier, Kenai Fjords, Alaska, aerial

Glacial carved landscape, Kenai Fjords, Alaska, aerial

McCarty Glacier, Kenai Fjords, Alaska, aerial

Grewingk Glacier, Kenai Mountains, Harding Icefield, Alaska, aerial

Grewingk Glacier, Kenai Mountains, Harding Icefield, Alaska, aerial

Grewingk Glacier, Kenai Mountains, Harding Icefield, Alaska, aerial

McCarty Fjord, Kenai Peninsula, Alaska, aerial

McCarty Glacier, Kenai Fjords, Harding Icefield, Alasak, aerial

Muldrow, Traleike & Brooks Glaciers, Alaska Range, aerial

Nilgiri Peak (7051m), Annapurna Himal, Nepal

Mountains glacier joins the Ruth Glacier, Alaska Range, aerial

Ruth Glacier, Alaska Range, aerial

Lateral moraine, Ruth Glacier, Alaska Range, aerial

Ruth Glacier, Alaska Range, aerial

Mount McKinley, Denali, Alaska Range, aerial

Mount McKinley, Denali, Alaska Range, aerial

Pioneer Ridge & Mount McKinley, Denali, Alaska Range, aerial

Straightaway & Foraker Glaciers, Alaska Range, aerial

Ruth Glacier & Gorge, Alaska Range, aerial

Algodones Dunes, Imperial Valley, southern California, aerial

Finley Mucking Machine, 2833 level Campbell Shaft, copper mine, Bisbee, Arziona

Flooded farm, Colorado River, western Arizona, July, 1983, aerial

Laguna Salada Fault, Baja Norte, Mexico, aerial

Mud curls, Painted Desert, Arizona

Ephemeral streams & alluvial surfaces, Sierra Mayor, Baja Norte, Mexico, aerial

Ephemeral streams & alluvial surfaces, Sierra Mayor, Baja Norte, Mexico, aerial

Dissected alluvial fans with desert pavement surfaces, Trigo Mountains, Colorado River Valley, western Arizona, aerial

Remnant alluvial fan ridges, Santa Catalina foothills, Tucson, Arizona, aerial

Umbrella stall, 2900 level, Campbell Shaft, copper mine, Bisbee, Arizona

Pneumatic drill at ore face, 2900 level Campbell Shaft, copper mine, Bisbee, Arizona

Cut & fill in 105 stope, 2833 level Campbell Shaft, copper mine, Bisbee, Arizona

Ore transfer chut, 2800 level Campbell Shaft, copper mine, Bisbee, Arizona

Ore train engine, 2700 level Campbell Shaft, copper mine, Bisbee, Arizona

Madera Canyon alluvial fan & fault zone, Santa Rita Mountains, southern Arizona, aerial

Fossil tusk in conglomerate, Vizcaino Peninsula, Baja, Mexico

Fossil sea shell in limestone, Point San Isidro, Baja, Mexico

Star sand dunes, Gran Desierto, Sonora, Mexico

Western Grand Canyon & Grand Wash Cliffs, NW Arizona, aerial

Deformed chert & graywacke layers, Isla San Benito, Baja, Mexico

Excavations at Murry Springs Clovis site, southeastern Arizona, 1971

Obsidian dome, Isla San Jose, Sea of Cortez, Mexico

Obsidian dome & tuff ring, Isla San Jose, Sea of Cortez, Mexico

Obsidian boulders, Isla San Jose, Sea of Cortez, Mexico

Sunset crater cinder cone, San Francisco Volcanic Field, Flagstaff, Arizona, aerial

Star dunes, Gran Desierto, Northwestern Sonora, Mexico

Ed Lehner holding a mammoth tooth & Clovis point, Lehner Ranch, Mammoth-kill site, southeastern Arizona

Fossil shell in conglomerate, Cedros Island, Baja California, Mexico

San Juan River cuts through Raplee Anticline, Mexican Hat, Utah, aerial

Ice Age beach ridges rimming Willcox Playa, formerly Lake Cochise, southeastern Arizona, aerial

Conglomerate, Isla Espiritu Santos, Sea of Cortez, Mexico

Volcanic crater, Isla San Luis, Sea of Cortez, Mexico

Wave cut terraces, Isla San Benito, Pacific Ocean, Baja California, Mexico

La Reforma Caldera, north of Santa Rosalia, Baja California, Mexico, aerial

Las Tres Virgenes statovolcanoes, Santa Rosalia, Baja California, Mexico, aerial

Las Tres Virgenes statovolcanoes, Santa Rosalia, Baja California, Mexico, aerial

Sand spit, Sea of Cortez, Mexico, aerial

Southeast flank of Sierra Juarez, northeastern Baja California, Mexico, aerial

Star sand dunes, Gran Desierto, northwest Sonora, Mexico

Long Valley Caldera from Deadman Pass, Sierra Nevada, California

Mount Saint Helens Volcano, summer 1981, Washington, aerial

Mount Saint Helens Volcano, summer 1981, Washington, aerial

Oregon Inlet, Pea Island, Outer Banks, North Carolina, aerial view north

Oregon Inlet, Pea Island, Outer Banks, North Carolina, aerial view south

Rocky Mountains, Jasper National Park, Alberta, Canada

Springs emerge from limestone caves & drain in bottom of sinkhole, Nippenose Valley, Pennsylvania

Strike Valley, Waterpocket Fold, Capitol Reef National Park, Utah

Braided glacial outwash river of Wosnesenski & Doroshin glaciers, Kenai Peninsula, Alaska, aerial

Alluvial fans along the west flank of the Black Mountains, south of Badwater, Death Valley, California, aerial

Badwater alluvial fan, Death Valley, California, aerial

Ephemeral drainages on an expansive bajada, Mojave Desert, southern California, aerial

Confidence Hills, Death Valley Fault, Amargosa River, Death Valley, California, aerial

Confidence Hills, Death Valley Fault, Amargosa River, Death Valley, California, aerial

Ephemeral drainage out of Contact Canyon in the Owlshead Mountains cuts through the Confidence Hills, Death Valley, California, aerial

Copper Canyon alluvial fan, Black Mountains, Death Valley, California, aerial

Copper Canyon alluvial fan, Black Mountains, Death Valley, California, aerial

Sand dunes, Death Valley National Park, California

Dust storm and dunes, Cadiz Dry Lake Beds, Mojave Desert, California

Racetrack Playa, Death Valley National Park, California, aerial

Saratoga Springs, Mojave Desert, southern California, aerial

Strandlines on Shoreline Butte, Death Valley, California, aerial

Talc Canyon alluvial fan, Owlshead Mountains, southern Death Valley, California, aerial

Ventifact, Death Valley, California

Wildrose graben, Panamint Valley, southern California, aerial

Terminus of the Taku Glacier, Juneau Icefield, Alaska, aerial.

Mount Taylor stratovolcano, San Mateo Mountains, Rio Grande Rift, New Mexico, aerial

Shiprock volcanic neck and dikes, northwestern New Mexico, aerial

Shiprock volcanic neck and dike, northwestern New Mexico, aerial

Shiprock volcanic neck and dike, northwestern New Mexico, aerial

Goosenecks, San Juan River, Mexican Hat, Utah

Intrusive contact, Laccolith, Mount Hillers, Henry Mountains, Utah

Mud cracks and ripple marks, San Rafael Swell, Utah

Mud curls, San Rafael Swell, Utah

Raindrop imprints and mud cracks, San Rafael Swell, Utah