|Geologic age||Late Devonian to Mississippian|
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Metamorphic > Metasedimentary > Metaclastic > Argillite (Greenschist)
Sedimentary > Carbonate (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Metamorphic > Schist (Greenschist)
Sedimentary > Clastic > Conglomerate (Bed)
Igneous > Volcanic (Volcaniclastic-volcanic breccia)
Metamorphic > Metasedimentary > Metaclastic > Slate (Greenschist)
|Comments||Brandon and others, 1988, maps the outcrop on Orcas Island as the East Sound Group (see also WAD), which is primarily andesitic to dacitic pyroclastic rocks, with rare lava flows, as well as minor limestone; he specifically distinguishes this rock group from the Deadman Bay Terrane which includes chert as well as basalt and limestone. May include incidental Turtleback Complex (see WApPMg and WApTm). The series of outcrops in Stevens County are composed of metalimestone, metadolomite, metaconglomerate, meta-argillite, metasiltstone, and metachert (Stoffel and others, 1991)|
|Stratigraphic units||East Sound Group (in part)|
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.
Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000.
Brandon, M.T., 1989, Geology of the San Juan-Cascade Nappes, northwestern Cascade Range and San Juan Islands, in Joseph, N. L. (Ed.), Geologic Guidebook for Washington and Adjacent Areas: prepared for the 85th Annual Meeting of the Cordilleran Section, Geological Society of America, May 8-11, 1989, Spokane, Washington: Washington Division of Geology and Earth Resource Infomation Circular 86, p. 137-162.
Brandon, M.T., Cowan, D.S., Vance, J.A., 1988, The Late Cretaceous San Juan thrust system, San Juan Islands, Washington: Geological Society of America Special Paper 221, 81 p. 1 pl.
|Counties||San Juan - Stevens|