Unit symbol: | Qs |
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Age range | Quaternary (1.806 to 0 Ma) |
Lithology: | Unconsolidated |
Group name: | Unconsolidated and poorly consolidated surficial deposits |
Source map | Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., and Shew, Nora, 2006, Digital datasets for geologic map by Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L.—Preliminary Integrated Geologic Map Databases for the United States: Digital Data for the Reconnaissance Bedrock Geologic Map for the Northern Alaska Peninsula area, Southwest Alaska: U.S. Geological Survey Open File Report 2006-1303, on-line only. http://pubs.usgs.gov/of/2006/1303/ |
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Symbol | Qal |
Unit name | Alluvium |
Description | Mainly gravel and coarse sand, consists in part of glacial and glaciofluvial material reworked by postglacial streams. Forms flood plains along major streams and rivers. |
Lithology | Unconsolidated |
Label | Qa |
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Description | Alluvium |
Geologic age | Pleistocene to Holocene |
Geologic setting | Unconsolidated |
Lithology | Form | Importance |
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Gravel < Coarse-detrital < Unconsolidated | Bed | Major |
Sand < Coarse-detrital < Unconsolidated | Bed | Major |
Coarse-detrital < Unconsolidated | Bed | Indeterminate, major |
Silt < Fine-detrital < Unconsolidated | Bed | Indeterminate, major |
Peat < Unconsolidated | Bed | Indeterminate, major |