Geologic Map of Alaska: Unconsolidated surficial deposits, undivided

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	Nokleberg, W.J., Aleinikoff, J.N., Lange, I.M., Silva, S.R., Miyaoka, R.T., Schwab, C.E., and Zehner, R.E., with contribution for selected areas from Bond, G.C., Richter, D.H., Smith, T.E., and Stout, J.H., 1992, Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Open File Report 92-594, scale 1:250,000 [Received as CAD coverage produced in 1996].
Symbol	Qwf
Unit name	Glaciofluvial deposits of Wisconsin glaciation
Description	Moderately well-stratified layers and lenses of well-rounded gravel with a matrix of silt and sand. Poorly to moderately well sorted with lenses of well-sorted sand locally.
Lithology	Unconsolidated

Correlated geologic units

Label	Qwo
Description	Outwash deposits, late Wisconsin-age Glaciations
Geologic age	Late-Pleistocene
Geologic setting	Unconsolidated

Lithology	Form	Importance
Sand < Coarse-detrital < Unconsolidated	Glacial, outwash	Major
Gravel < Coarse-detrital < Unconsolidated	Glacial, outwash	Indeterminate, major
Silt < Fine-detrital < Unconsolidated	Glacial, outwash	Minor