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 Detterman, R.L., and Reed, B.L., 1973, Surficial deposits of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-A, 64 p., 1 plate, scale 1:250,000.
Symbol Qkm
Unit name Mak Hill Glaiciation, Kulakeklek Stade, terraced and modified morainal deposits
Description Mak Hill Glaciation, terraced and modified morainal deposits. Found several miles behind moraine front; most probably deposited as ground moraine, subsequently modified by meltwaters from later Brooks Lake glaciation and by loess deposition
Lithology Unconsolidated

Correlated geologic units

Label Qmhg
Description Early Wisconsin (Mak Hill and Iowithla) ground moraine
Geologic age Pleistocene
Geologic setting Unconsolidated
Lithology Form Importance
Gravel < Coarse-detrital < Unconsolidated Glacial, till Major
Sand < Coarse-detrital < Unconsolidated Glacial, till Major
Boulders < Coarse-detrital < Unconsolidated Glacial, till Indeterminate, major