Skip to main content

Slope Formation

Gray-brown and yellow-brown silt, sand, clay, sandstone, and lignite; river, lake, and swamp sediment; as thick as 100 meters (300 feet).
State North Dakota
Name Slope Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Paleocene
Primary rock type silt
Secondary rock type sand
Other rock types clay or mud; sandstone; coal
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Silt (Bed)
Minor
Sedimentary > Coal (Bed)
Map references
Clayton, Lee, 1980, Geologic Map of North Dakota: U. S. Geological Survey, Scale 1:500K.
Unit references
Clayton, Lee, 1980, Geologic Map of North Dakota: U. S. Geological Survey, Scale 1:500K.
Counties Adams - Bowman - Golden Valley - Grant - Morton - Oliver - Sioux - Slope