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Source map Wilson, F.H., 2012, Unpublished data.
Symbol Qus?
Unit name Upland silt and sand
Description Predominantly wind blown very fine sand and silt. Includes some clay and layers and lenses of chert granules and pebbles. Stratification indistinct. Gravelly sand to sandy gravel locally composes lower part of deposit. Clasts predominantly pebble-sized, well rounded, and composed of chert and quartz. Very poorly exposed. Qus1 deposits overlay discontinuous deposits of pebble, cobble, and boulder gravel, as much as 10 m thick in southwestern part of the quadrangle that are eroded remnants of ancient fluvial or glaciofluvial terraces which are much older than the gravel of Qus2.
Lithology Unconsolidated

Correlated geologic units

Label Qfl
Description Loess, including Fairbanks loess
Geologic age Pleistocene to Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Silt < Fine-detrital < Unconsolidated Eolian, Loess Major