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Gullies in roadcut, Iowa City

Point bar, Iowa River

Mudcracks, marsh, NW Iowa

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

Sill intruding Cretaceous sedimentary rocks in Colorado Canyon

Dirt cone, Athabasca glacier

Multiple hoodoos

Lizard on a bush

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

Lower, less dissected part of Bryce Canyon

Grizzly bear and cubs walking across outwash

Rocky Mountain Erosion Surface, Wyoming

Summer wildflowers in the high country

Lower Yosemite Falls

Two kinds of dinosaur tracks in rocks in Dakota Hogback, Denver

Crater Lake 5

Mt. Wheeler Scenic Area, Great Basin National Park

View of Death Valley, volcanic cones in middle ground

Stacks, arches, marine terrace, Anacapa Island

Spheroidal weathering 2

High peaks in North Cascades National Park

Iceberg Lake in Glacier National Park

Inactive pediment, east side of Laramie Range, Wyoming

Temperature profile under Yellowstone National Park

Graded bedding in sand and gravel

Harding Ice Field

Hoodoos along the trail

Helictites ignore gravity

Empty lava tube

Parabolic sand dunes, eastern Colorado, from the air

Fossil reef facies, Australia

Humpback Whale

Exfoliation, Yosemite

Caliche, Borchers, Kansas

Relative ages of dikes