Pliocene marine rocks (WAPO;0)

State	Washington
Name	Pliocene marine rocks
Geologic age	Pliocene
Original map label	PL
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.
Primary rock type	siltstone
Secondary rock type	sandstone
Other rock types	conglomerate
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. [http://pubs.er.usgs.gov/publication/i994] 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 coverage	Grays Harbor