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 Williams, J.R., 1983, Engineering-geologic maps of northern Alaska, Meade River quadrangle: U.S. Geological Survey Open-File Report 83-294, 32 p., 1 sheet, scale 1:250,000.
Symbol Qb
Unit name Marine beach, bar, and spit deposits
Description Chiefly coarse to fine sand and granule and pebble gravel. Cobbles and boulders as large as 12 cm occur locally as surface layer and as beds and lenses in finer gravel deposits. Gravel well-rounded, locally polished chert, quartzite, quartz, and other rock types. Generally less than 6 percent silt
Lithology Unconsolidated

Correlated geologic units

Label Qb
Description Beach deposits
Geologic age Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Sand < Coarse-detrital < Unconsolidated Beach Major
Gravel < Coarse-detrital < Unconsolidated Beach Indeterminate, major