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Gullies in roadcut, Iowa City

Point bar, Iowa River

Mudcracks, marsh, NW Iowa

Iowa City flood, 1993

Slump at Saylorville Reservoir, Iowa

Iowa City flood 2, 1993

Mudcracks, animal tracks, NW Iowa

Loveland loess type section, western Iowa

Terrace on Sioux River, NW Iowa

Paleosol, Klein Quarry, Iowa City 3

Paleosol, Conklin Quarry, Iowa City 1

Paleosol, Klein Quarry, Iowa City 1

Paleosol, Conklin Quarry, Iowa City 2

Formation of crossbedding 5, Iowa River

Sand wedge, Sixt quarry, Iowa City

Sangamon paleosol, Klein Quarry, Iowa City

Paleosol, Klein Quarry, Iowa City 2

Loess Hills and Missouri River floodplain, western Iowa

Roadcut in Harrison Co., western Iowa, showing prominent layer of volcanic ash from 600 thousand-year-old Yellowstone eruption

Black Canyon of the Gunnison River 1

Sill intruding Cretaceous sedimentary rocks in Colorado Canyon

Solifluction lobes 2, Yukon

Canyonlands on cloudy day

Morrison Formation, in which dinosaur bones are found, showing typical colors

Beargrass (Xerophyllum tenax) scattered in forest openings 1

Dirt cone, Athabasca glacier

Bergschrund--crack where glacier separates from rock at source

Wrangell-St. Elias from the air showing numerous glacial features 7

Bromeliads (epiphytes) growing on Cypress

Granite-diorite contact

Jailhouse in Terlingua, 1974 (it is now a rest room for a restaurant)

Badlands from west end overlook, dawn

Kame terrace, east side of Yellowstone River Valley south of Yellowstone Lake

Airfall tephra layers near Halema u'mau Crater

Classic U-shaped glacial valley, exfoliation domes, and Half Dome

Xenolith in basalt

Braided stream from Kaskawulsh Glacier, St. Elias Range

Side canyon from Widforss Trail, North Rim

Multiple hoodoos

Red firs from knob above resort

Rock glacier 3

Waterfall at Elves Chasm 4

Rialto Beach, stacks in the distance

The Fallen Cross, Green River

Cows grazing in field below volcano

Lizard on a bush

Storage tanks overrun by lava

Cross section of pediment, east side of Laramie Range, Wyoming