Pliocene marine rocks

Coarse conglomerate, shale, and minor sandstone; along ocean beaches in Grays Harbor County.
State Washington
Name Pliocene marine rocks
Geologic age Pliocene
Lithologic constituents
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Comments Siltstone, sandstone, and conglomerate are fossiliferous, concretionary, and/or carbonaceous. There may also be some outcrops of the Quinault further north along the coast in what is mapped as WAM and WAOLM, though I have chosed not to include it in those unit descriptions as it makes up a very small proportion of those units.
Stratigraphic units Quinault formation

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.

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.

Tabor, R.W. and Cady, W.M., 1978, Geologic Map of the Olympic Peninsula, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-994, scale 1:125,000.

Rau, W.W., 1979, Geologic Map in the Vicinity of the Lower Bogachiel and Hoh River Valleys, and the Washington Coast: Washington Division of Geology and Earth Resources Geologic Map GM-24, scale 1:62,500.

Rau, W.W., 1970, Foraminifera, Stratigraphy, and Paleoecology of the Quinault Formation, Point Grenville-Raft River Coastal Area, Washington: Washington Division of Mines and Geology Bulletin no. 62, 41 p.

NGMDB product
Counties Grays Harbor