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., Houseknecht, D.W., Pessel, G.H., and Garrity, C.P., 2005, Geologic map of the Ikpikpuk River quadrangle, Alaska: U.S. Geological Survey Scientific Investigations Map 2817-B, 1 sheet, scale 1:250,000. [http://pubs.usgs.gov/sim/2005/2817b/]
Symbol Qu
Unit name Surficial deposits, undifferentitated
Description Tundra-covered, fine-grained, organic-rich silt, loess, and local colluvium and fine-grained alluvial sand and silt in areas adjacent to upland slopes. Also includes unstratified marine sand, silt, and local gravel derived from the Gubik Formation, which underlies much of area of abundant shallow lakes in the northern part of the Ikpikpuk River quadrangle and adjacent areas in Arctic coastal plain, but is not differentiated on map. Includes vegetated eolian sand dunes in northern part of quadrangle
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