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 Wilson, F.H., Weber, F.R., Dochat, T.M., Miller, T.P., and Detterman, R.L., 1997, Revised geologic map of the Cold Bay and False Pass quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 97-866, 34 p., 1 sheet, scale 1:250,000.
Symbol Qblk
Unit name Drift, Kvichak Stade, Brooks Lake glaciation
Description Large arcuate end moraines that form the outer part of the morainal ridges that bound Morzhovoi and Cold Bays. Formed mainly of till and stratified ice-contact deposits. Forms a large part of the Cold Bay Formation of Funk (1973) as mapped; however, measured section as described by Funk (1973) is in unit Qbln of this map. Weathering of clasts in these deposits is minor, largely confined to the partial disintegration of sedimentary clasts (Detterman, 1986), similar to the Iliamna Stade drift
Lithology Unconsolidated

Correlated geologic units

Label Qw0
Description Till, Brooks Lake, Kvichak [Ground moraine assigned Qclass of 1395]
Geologic age Late-Pleistocene
Geologic setting Unconsolidated
Lithology Form Importance
Gravel < Coarse-detrital < Unconsolidated Glacial Major
Boulders < Coarse-detrital < Unconsolidated Glacial Indeterminate, major
Sand < Coarse-detrital < Unconsolidated Glacial Indeterminate, major
Silt < Fine-detrital < Unconsolidated Glacial Indeterminate, major