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Pliocene marine rocks

Coarse conglomerate, shale, and minor sandstone; along ocean beaches in Grays Harbor County.
StateWashington
NamePliocene marine rocks
Geologic agePliocene
Original map labelPL
CommentsSiltstone, 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.
Primary rock typesiltstone
Secondary rock typesandstone
Other rock typesconglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Bed)
Map references
Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.
Unit references
Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., 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.
Geographic coverageGrays Harbor

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