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 Mull, C.G., Harris, E.E., Reifenstuhl, R.R., and Moore, T.E., 2000, Geologic map of the Coke Basin-Kukpowruk River area, De Long Mountains D-2 and D-3 quadrangles, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2000-2, 1 sheet, scale 1:63,360. doi:10.14509/2737.
Symbol Qu
Unit name QUATERNARY DEPOSITS, UNDIFFERENTIATED
Description Fine-grained colluvial deposits of reworked silt, with minor sand, pebbles, cobbles, and thin bedrock slabs, typically found on gentle slopes as apron-like features or a blanketing mantle over low hills and ridges. Material is derived from underlying or nearby topographically higher bedrock unit and transported by frost creep and gelifluction. Unit is gradational with other surficial deposits. Often exhibits horsetail drainage patterns from ephemeral streams. In areas of poor drainage, surface is typically characterized by broad expanses of grass tussocks.
Lithology Unconsolidated

Correlated geologic units

Label Qs
Description Surficial deposits, undifferentiated
Geologic age Pleistocene to Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Gravel < Coarse-detrital < Unconsolidated Bed Indeterminate, major
Sand < Coarse-detrital < Unconsolidated Bed Indeterminate, major
Clay < Fine-detrital < Unconsolidated Bed Indeterminate, major
Silt < Fine-detrital < Unconsolidated Bed Indeterminate, major
Peat < Unconsolidated Bed Indeterminate, major