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Source map Wilson, F.H., 2009, Unpublished data.
Symbol Qoc
Unit name Ground moraine, channeled
Description Distinctive surface form subdivided from Weber(1961) unit 13. Thought to emulate her 13f in eastern part of quadrangle. 13f description: Deposit of unsorted, unstratified boulders, pebbles, sand, silt, and a small amount of clay, up to 250 feet thick. Locally, boulders exposed on surface may exceed 5 feet in diameter. Components vary greatly in composition depending on lithologies present in source areas -- granitic rocks volcanic rocks, argillite, chert, limestone, quartz, quartzite, graywacke, slate -- generally the most resistant rocks persist. Many small boulders and pebbles are well-rounded. Till is gray and covered in most places with 2 to 5 feet of reddish clay, silt, and sand. Five to 20 feet of thick veneer of ground moraine deeply cut by channels, the bottom of which contain coarse boulders, gravel, and sand overlying various types of bedrock.
Lithology Unconsolidated

Correlated geologic units

Label Qoc
Description Channeled glacial deposits -- kame and kettle? (Qoc, TY007; TL004; 13f, TL007; TY016)
Geologic age Late-Pleistocene to Holocene
Geologic setting Unconsolidated
Lithology Form Importance
Coarse-detrital < Unconsolidated Glacial, till Indeterminate, major