Glaciofluvial, lacustrine, and pediment sedimentary deposits

Unconsolidated, poorly sorted silt, sand, and gravel. Includes lacustrine deposits west of Columbia River Gorge (Trimble, 1963). Mostly in northern Morrow and Umatilla Counties where unit represents deposits of swollen late Pleistocene Columbia River (Hogenson, 1964)
State Oregon
Name Glaciofluvial, lacustrine, and pediment sedimentary deposits
Geologic age Pleistocene
Lithologic constituents
Unconsolidated > Coarse-detrital > Sand (Glacial, Fluvial, Lacustrine)
Unconsolidated > Fine-detrital > Silt (Glacial, Fluvial, Lacustrine)
Unconsolidated > Coarse-detrital > Gravel (Glacial, Fluvial, Lacustrine)
Comments In OR292, unit includes late Pleistocene Missoula flood deposits consisting of unconsolidated to semi-consolidated deposits of sand, gravel, and silt

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Walker, G.W., 1973, Reconnaissance geologic map of the Pendleton quadrangle, Oregon and Washington: U.S. Geological Survey Miscellaneus Geologic Investigations Map I-727, scale 1:250,000.

Walker, G.W., 1977, Geologic map of Oregon east of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-902, scale 1:500,000.

Ferns, M.L., McConnell, V.S., and Madin, I.P., in prep., Geology of the Umatilla River Basin, Morrow, Umatilla, and Union Counties, Oregon: Oregon Department of Geology and Mineral Industries Open-File Report, 66 p., scale 1:100,000.

NGMDB product
Counties Clackamas - Columbia - Morrow - Multnomah - Umatilla - Union