Triassic sedimentary rocks, undivided (WATR;0)

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	NGMDB product page for 30777
Counties	Asotin - Ferry - Okanogan - San Juan

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

NGMDB product page for 30777

Counties

Asotin - Ferry - Okanogan - San Juan