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Unconsolidated surficial deposits, undivided

Unit symbol: Qs
Age range Quaternary (1.806 to 0 Ma)
Lithology: Unconsolidated
Group name: Unconsolidated and poorly consolidated surficial deposits
Unconsolidated, poorly to well-sorted, poorly to moderately well-stratified deposits; consist predominantly of alluvial, colluvial, marine, lacustrine, eolian, and swamp deposits. May include some glacial deposits. Also includes widespread glacial and periglacial deposits that consist of end, lateral, and ground moraine, outwash, rock glacier deposits, and other glacial and periglacial deposits as well as glacially scoured bedrock that may be covered with thin, glacially derived deposits. These glacial deposits are of Holocene and Pleistocene age and may include small areas of potentially latest Tertiary deposits. Map unit locally includes reworked volcanic debris as well as block and ash flows. On generalized map, shown as part of unit QTs

Source map information

Source map Wilson, F.H., 2015, Reconnaissance Surficial Geologic Map of the Taylor Mountains Quadrangle, Southwestern Alaska: U.S. Geological Survey Scientific Investigations Map 3334, pamphlet, 1 sheet, scale 1:250,000.
Symbol Qom
Unit name Glacial deposits of the Okstukuk glaciation -- moraine
Description Loop, recessional, lateral, and medial moraine, composed chiefly of coarse gravel and coarse gravelly till, but includes undifferentiated organic and lacustrine material of the Okstukuk glaciation
Lithology Unconsolidated

Correlated geologic units

Label Qw0
Description Till, Brooks Lake, Kvichak [Ground moraine assigned Qclass of 1395]
Geologic age Late-Pleistocene
Geologic setting Unconsolidated
Lithology Form Importance
Gravel < Coarse-detrital < Unconsolidated Glacial Major
Boulders < Coarse-detrital < Unconsolidated Glacial Indeterminate, major
Sand < Coarse-detrital < Unconsolidated Glacial Indeterminate, major
Silt < Fine-detrital < Unconsolidated Glacial Indeterminate, major