Cretaceous sedimentary rocks, mostly marine (WAKu;0)

State	Washington
Name	Cretaceous sedimentary rocks, mostly marine
Geologic age	Cretaceous
Original map label	Ku
Comments	Huntting and others, 1961, originally places Virginian Ridge Formation in WAKl, referencing a 1958 unpublished map by Barksdale but more recent mapping by Barksdale (1975) shows that most of the Virginian Ridge Formation is actually in this unit. Virginian Ridge Formation is 1080-11,600 ft. thick and Winthrop Sandstone is 0-13,500 ft thick (Barksdale, 1975).
Primary rock type	arkose
Secondary rock type	siltstone
Other rock types	shale; graywacke; conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Sandstone > Arkose (Bed) Minor Sedimentary > Clastic > Siltstone (Bed) Incidental Sedimentary > Clastic > Sandstone > Graywacke (Bed) Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Mudstone > Shale (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. Barksdale, J. D., 1975, Geology of the Methow Valley, Okanogan County, Washington: Washington Division of Geology and Earth Resources Bulletin no. 48, 72 p.
Geographic coverage	Okanogan - Whatcom