Mineral Resources On-Line Spatial Data
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Geologic units in Payette county, Idaho
- Basalt flows and incidental andesite, and latite flows; Miocene mafic to intermediate volcanics; subunits are Tmib, Tm1b, Tm2b, Tm3b; Columbia Plateau, Owyhee Plateau (Miocene) at surface, covers 10 % of this area
Miocene plateau basalt flows of western Idaho; subdivisions are (Tm3b, Tm2b, Tm1b).
- Clay, silt, and minor sand; Late Pleistocene distal glacial-flood deposits; western Snake River Plain (Late Pleistocene) at surface, covers 15 % of this area
Pleistocene waterlaid detritus; may be distal deposits of glacial floods and outwash.
- Tuff, arkose, claystone, siltstone, conglomerate, lignite; Miocene alluvial and lacustrine deposits (Miocene) at surface, covers 0.7 % of this area
Miocene stream and lake deposits; generally associated with volcanic episodes.
- Open Water (Holocene) at surface, covers < 0.1 % of this area
- Gravel, sand, and silt; Quaternary; alluvium (Quaternary) at surface, covers 16 % of this area
Quaternary alluvium; may contain some glacial deposits and colluvium in uplands
- Gravel, sand, and silt; glacial outburst flood deposits, outwash, fanglomerate, and alluvium, undivided; Pleistocene (Pleistocene) at surface, covers 10 % of this area
Pleistocene outwash, fanglomerate, flood and terrace gravels; sudivisions are: (Qpug, Qpmg, and Qplg).
- Open Water (Holocene) at surface, covers 0.3 % of this area
Lakes and streams
- Alluvial deposits (Holocene) (Holocene) at surface, covers < 0.1 % of this area
Sand, gravel, and silt forming flood plains and filling channels of present streams. In places includes talus and slope wash. Locally includes soils containing abundant organic material, and thin peat beds
- Sandstone, conglomerate, siltstone, tuff, claystone, limestone, and diatomite; Pliocene tuffaceous alluvial and lacustrine deposits; Snake River Plain and vicinity, southeastern Idaho (Pliocene ) at surface, covers 49 % of this area
Pliocene stream and lake deposits; may be due to volcanic and block-faulting events.