USGS DDS-21 Image of the Half Day

Glaciation: ID. Alden, W.C. 62

End profile of the west drumlin, SE1/4 sec. 2, T. 5 N., R. 11 E. Dane County, Wisconsin. July 21, 1902.

Earthquake: ID. WILSHIRE, HOWARD G. 2ct

Aerial view of collapsed section of the Cypress viaduct of Interstate 880. Loma Prieta Earthquake. Oakland, California. 1989.

Glaciation: ID. Carrara, P. 145ct

Wood Mountain arete, elevation 13,600 feet. San Juan Mountains. Hinsdale County, Colorado. August 3, 1971.

Erosion: ID. Trimble, D.E. 18cp

Oblique aerial view of Pawnee Buttes in northeastern Colorado. Buttes isolated by erosion from High Plains in background. Ogallala Formation caps top of buttes. White River Group forms lower part. The top of the highest butte is about 240 feet above the saddle between the buttes. Weld County, Colorado. n.d.

Metamorphic Processes: ID. Grauch, R.I. 53ct

Core sample showing marble. Jabiluka-type gold deposits. Northern Territory, Australia. ca. 1985.

Volcano: ID. USGS/HVO 214ct

Mauna Ulu. Lava enters sea at Kaena Point. Kilauea east rift. Hawaii Volcanoes National Park. Hawaii County, Hawaii. September 17, 1972.ID. USGS/HVO 237ct Mauna Ulu. Lava enters sea west of Apua Point. Kilauea east rift, Hawaii Volcanoes National Park. Hawaii County, Hawaii. 1973.

Ocean Shorelines: ID. McKee, E.D. 628ct

Looking down at Tasman Sea and sea stack, near 14 mile Bluff. South Island, New Zealand. 1976.

Weathering: ID. Huber, N.K. 1aCt

Half Dome at sunset, Yosemite National Park. Mariposa County, California. n.d. (Photo by D. Peck)

Sedimentary Processes: ID. McKay, E.J. 39ct

Types of limy sandstone concretions, Wasatch Formation. Powder River Basin. Wyoming. ca. 1953.

Fluvial Processes: ID. MALDE, H. E. 3994ct

Upstream view of Lance Creek from Kaycee Lightning terrace that is flooded about every 10 years. 2500' S., 650' E., NW cor. sec. 36, T. 37 N., R. 65 W. Funny Rock quadrangle. Niobrara County, Wyoming. June 25, 1981.

Fluvial Processes: ID. Goudarzi, G.H. 19:

Playa lake in Fezzan. Aerial view of the saline lake at Nashnusha, about 60 km northwest of Umm Al Abyad in the Ubari Sand Sea. This lake dries up in the summer. In the background are the high sand dunes in step from several tens of meters high. To the right of center are the deposits of sodium carbonate in the bottom of the lake. The striped pattern results from troughs dug in the lake to concentrate the sodium carbonate. Libya. ca. 1958.

Erosion: ID. Martin, G.C. 611

Gullying in secondary ash accumulation at base of steep hillside, near Kodiak. Katmai Eruption. Kodiak district, Southwestern Alaska region, Alaska. July 16, 1912.

Earthquake: ID. California Earthquake 26

Building at San Fernando Valley Juvenile Hall located astride the margin of a lateral spred that produced 3 feet of horizontal ground displacement beneath the structure during the February 1971 earthquake. Los Angeles County, California.

Deformation: ID. Pierce, W.G. 381

Cross sectional view of the South Sunshine anticline looking south across Gooseberry Creek from center of SE 1/4 sec. 4, T.46 N.,R. 101 W. The oldest formation exposed is Morrison. The Cloverly formation forms the prominent scarps which outline the anticline. Park County, Wyoming. September 1935.

Mass Wasting: ID. MSH-Schuster, R.L. 84ct

Aerial view of lahar in upper North Fork Toutle River Valley. Cowlitz County, Washington. July 11, 1980.

Weathering: ID. Erdmann, C.E. 302

Lower member of the Sego sandstone, This is characteristic of many sandstones in the overlying beds. The erosional effects are due to solution. Sec. 30, T. 7 S., R.102 W., Garfield County, Colorado. October 1927.

Metamorphic Processes: ID. Hamilton, W.B. 690ct

Laminated slate. Central Great Smoky Mountains. Tennessee. ca. 1954.

Ocean Shorelines: ID. Allen, H.B. 46:

Beach at Boxer Bay, St. Lawrence Island. Bering Sea region, Alaska. September 1948.

Mass Wasting: ID. ALASKA EARTHQUAKE 238

Sherman Glacier showing conditions before the 1964 earthquake: compare with Alaska Earthquake no. 239. Note medial and laterial moraines. Cordova district, Alaska Gulf region, Alaska. August 26, 1963.

Glaciation: ID. Hamilton, W.B. 530ct

Moraine forming at foot of Taylor Glacier. McMurdo Sound area, Victoria Land, Antarctica. December 15, 1958.