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Mesozoic-Tertiary volcanic rocks, undivided

Altered basalt, pillow lavas, and flow breccia of inner volcanic belt of Olympic Peninsula; includes minor interbedded red limy argillite and associated manganese ore.
StateWashington
NameMesozoic-Tertiary volcanic rocks, undivided
Geologic ageOligocene to Eocene
Original map labelMZTv
Primary rock typebasalt
Secondary rock typesandstone
Other rock typesgreenstone; diabase; gabbro; argillite
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Minor
Metamorphic > Greenstone (Zeolitic (prehnite-pumpellyite))
Sedimentary > Clastic > Sandstone (Bed)
Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic, tuff)
Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic, volcanic breccia)
Incidental
Metamorphic > Argillite (Zeolitic (prehnite-pumpellyite))Protolith possibly limestone listed by Dragovich and others, 2002.
Igneous > Plutonic > Dioritic > Diorite (Dike or sill)
Igneous > Plutonic > Gabbroic > Gabbro (Dike or sill)
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.
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.
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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