The area of MC-28 is centered on the east edge of the Hellas Planitia (Hellas basin and surrounding plains) within densely cratered terrain that covers more than half the surface of Mars (Carr, 1973, fig. 1). The deepest part of the basin lies 4-5 km below the surface of the cratered terrain (Hanel and others, 1972). An irregular band of mountain and knobby material about the eastern margin and th

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Geologic map of the Cape Foulweather and Euchre Mountain quadrangles, Lincoln County, Oregon

Geologic map of the Chinese Camp and Moccasin Quadrangles, Tuolumne County, California

Geologic map of the Cordova B-2 quadrangle and northern part of the Cordova A-2 Quadrangle, south-central Alaska

Geologic map of the Craig 1 x 2 Quadrangle, northwestern Colorado

Geologic map of the Del Norte area, eastern San Juan Mountains, Colorado

Geologic map of the Eagle Quadrangle, Alaska

Geologic map of the eastern San Francisco Volcanic Field, Arizona

Geologic map of the Elysium Quadrangle of Mars

Geologic map of the Fairbanks D-1 SW Quadrangle, Alaska

Geologic map of the Fairbanks D-2 SE Quadrangle, Alaska

Geologic map of the Fairbanks D-2 SW Quadrangle, Alaska

Geologic map of the Hellas Quadrangle of Mars

U.S. Geological Survey

U.S. Department of the Interior