Mesozoic-Tertiary marine rocks, undivided

Dark-gray, massive to poorly bedded gray-wacke of the interior Olympic Peninsula; commonly with interbedded slate, argillite, volcanic rocks, and minor arkosic sandstone. Includes rocks both older and younger than Ev2, some of which may be Paleozoic.
State Washington
Name Mesozoic-Tertiary marine rocks, undivided
Geologic age Miocene to Eocene
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Argillite
Metamorphic > Metasedimentary > Metaclastic > Slate
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Minor
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Incidental
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Igneous > Plutonic > Gabbroic > Gabbro (Dike or sill)
Sedimentary > Coal (Bed)
Stratigraphic units Hoh Formation (in part); Western Olympic Lithic, Elwha Lithic, Grand Valley Lithic, and Needles-Gray Wolf Lithic assemblages of Tabor and Cady, 1978
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.

Snavely, P.D., Kvenvolden, K.A., Rapp, J.B., Hostettler, F.D., and Golen-Bac,M., 1989, Preliminary evaluation of the petroleum potential of the Tertiary accretionary terrane, west side of the Olympic Peninsula, Washington: U. S. Geological Survey Bulletin 1892, 45 p.

Tabor, R.W., Yeats, R.S., Sorensen, M.L., 1972, Geologic Map of the Mount Angeles Quadrangle, Clallum and Jefferson Counties, Washington: U. S. Geological Survey Geologic Quadrangle Map GQ-958, scale 1:62,500.

Snavely, P.D., MacLeod, N.S., Niem, A.R., 1993, Geologic map of the Cape Flattery, Challam Bay, Ozette Lake, and Lake Pleasant Quadrangles, Northwestern Olympic Peninsula, Washington: U. S. Geological Survey Map I-1946, scale 1:48,000.

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.

NGMDB product
Counties Clallam - Grays Harbor - Jefferson - Mason