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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.
StateWashington
NameMesozoic-Tertiary marine rocks, undivided
Geologic ageMiocene to Eocene
Original map labelMZT
Primary rock typegraywacke
Secondary rock typesiltstone
Other rock typesslate; phyllite; argillite; arkose; siltstone; conglomerate; coal; basalt; gabbro
Lithologic constituents
Minor
Metamorphic > Phyllite
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Metamorphic > Slate
Incidental
Sedimentary > Coal (Bed)
Igneous > Plutonic > Gabbroic > Gabbro (Dike or sill)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Metamorphic > Argillite
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.
Snavely, P. D., Kvenvolden, K. A., Rapp, J. B., Hostettler, F. D., 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.
Geographic coverageClallam - Grays Harbor - Jefferson - Mason

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