State | Washington |
---|---|
Name | Triassic sedimentary rocks, undivided |
Geologic age | Triassic with Permian where impossible to differentiate |
Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed, Lens)
Minor
Metamorphic > MetasedimentaryIncludes meta-argillite, metasandstone, metaconglomerate, metachert, and metamudstone, mostly on San Juan Islands (Dragovich and others, 2002).
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Metamorphic > Metasedimentary > Metacarbonate > Marble
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Metamorphic > Metaigneous > Greenstone (Greenschist)Are tuffs, flows or intrusives depending on original rock (Parker and Calkins, 1964).
Sedimentary > Clastic > Siltstone (Bed)
Metamorphic > Metasedimentary > Metaclastic > Slate
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > Clastic > Sandstone (Bed)
|
Comments | Limestone and dolomite in Asotin County (Martin Bridge Limestone). San Juan Islands consist mostly of metasedimentary rocks (see lithology coding). |
Stratigraphic units | Haro Formation; Martin Bridge Limestone; Constitution Formation (in part: Orcas Island); Orcas chert (in part) |
References | Huntting, M.T., Bennett, W.A.G., Livingston, V.E.Jr., and Moen, W.S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.Parker, R.L. and Calkins, J.A., 1964, Geology of the Curlew Quadrangle Ferry County Washington, U.S. Geological Survey Bulletin 1169, 95 p.https://pubs.er.usgs.gov/publication/b1169 Reidel, S.P., Hooper, P.R., Webster, G.D., Camp, V.E., 1992, Geologic Map of Southeastern Asotin County, Washington: Washington Division of Geology and Earth Resources Geologic Map GM-40, scale 1:48,000.Brandon, M.T., 1989, Geology of the San Juan-Cascade Nappes, northwestern Cascade Range and San Juan Islands, in Joseph, N. L. (Ed.), Geologic Guidebook for Washington and Adjacent Areas: prepared for the 85th Annual Meeting of the Cordilleran Section, Geological Society of America, May 8-11, 1989, Spokane, Washington: Washington Division of Geology and Earth Resource Infomation Circular 86, p. 137-162.Rinehart, C.D., and Fox, K.F.Jr., 1976, Bedrock Geology of the Conconully Quadrangle, Okanogan County, Washington: U. S. Geological Survey Bulletin 1402, 58 p.Dragovich, J.D., Logan, R.L., Schasse, H.W., Walsh, T.J., Lingley, W.S., Jr., Norman, D.K., Gerstel, W.J., Lapen, T.J., Schuster, J.E., Meyers, K.D., 2002, Geologic Map of Washington-Northwest Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-50, scale 1:250,000. |
NGMDB product | |
Counties | Asotin - Ferry - Okanogan - San Juan |