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 Williams, J.R., and Carter, L.D., 1984, Engineering-geologic maps of northern Alaska, Barrow quadrangle: U.S. Geological Survey Open-File Report 84-124, 39 p., 2 sheets, scale 1:250,000.
Symbol Qt
Unit name Thaw lake deposits
Description Chiefly fine- to medium sand in areas of eolian and alluvial deposits, silty sand in marine deposits, and silt to fine sand in upland silt. May include pebble beds and lenses or discrete pebbles where derived from alluvium and marine sand and beach deposits. Commonly silty and organic rich
Lithology Unconsolidated

Correlated geologic units

Label Ql
Description Lacustrine deposits, generally not glacial lakes
Geologic age Pleistocene to Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Silt < Fine-detrital < Unconsolidated Bed Major