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 Smith, T.E., 1981, Geology of the Clearwater Mountains, south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 60, 73 p., 1 sheet, scale 1:63,360.
Symbol Qs
Unit name Swamp deposits
Description Accumulations of silt and sand in areas of poor drainage with large amounts of intermixed vegetative matter. Periodically covered by standing water. Away from rivers, swamps are probably drained lake basins
Lithology Unconsolidated

Correlated geologic units

Label Qsw
Description Swamp deposits
Geologic age Pleistocene to Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Silt < Fine-detrital < Unconsolidated Swamp Major
Clay < Fine-detrital < Unconsolidated Swamp Indeterminate, major
Peat < Unconsolidated Swamp Indeterminate, major