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., Robinson, M.S., Weber, F.R., Waythomas, C.W., and Reifenstuhl, R.R., 1994, Geologic map of the Upper Chena River area, eastern interior Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 115, 1 sheet, scale 1:63,360, pamphlet, 19 p.
Symbol Qcg
Unit name Gelifluction deposits
Description Poorly sorted to angular gravel with varying amounts of sand, silt, and clay. Forms lobate sheets or individual tongues of reworked sediments on underlying deposits that are prone to seasonal freezing and thawing. Well developed in older, subdued glacial drift
Lithology Unconsolidated

Correlated geologic units

Label Qsf
Description Solifluction deposits
Geologic age Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Sand < Coarse-detrital < Unconsolidated Solifluction Major
Silt < Fine-detrital < Unconsolidated Solifluction Major
Gravel < Coarse-detrital < Unconsolidated Solifluction Minor
Peat < Unconsolidated Solifluction Minor