Paleocene-Cretaceous nonmarine rocks (WATKc;0)

State	Washington
Name	Paleocene-Cretaceous nonmarine rocks
Geologic age	Eocene (see age coding)
Lithologic constituents	Major Sedimentary > Clastic > Sandstone > Arkose (Bed)Also includes minor tuffaceous sandstone. Minor Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Conglomerate (Bed, Lens) Incidental Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Coal (Bed) Igneous > Volcanic (Pyroclastic-tuff)
Comments	Two polygons on the digital coverage are tagged as TKc (the original name of this unit). Chumstick formation is usually referred to as Swauk formation but is younger in age (middle Eocene as opposed to early Eocene) (Tabor and others, 1987).
Stratigraphic units	Chuckanut Formation; Guye Formation; Pipestone Canyon Formation; Swauk Formation; Chumstick formation
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. Easterbrook, D.J., 1976b, Geologic Map of Western Whatcom County, Washington: U.S. Geological Survey Miscellaneous Investigations Series Map I-854-B, scale 1:62,500. https://pubs.er.usgs.gov/publication/i854B Misch, P., 1977, Bedrock Geology of the North Cascades, in Brown, E. H. and Ellis, R. C. (eds.), Geological Excursions in the Pacific Northwest, Geological Society of America 1977 Annual Meeting, Seattle: Western Washington University, p. 1-62. Foster, R.J., 1960, Tertiary Geology of a Portion of the Central Cascade Mountains, Washington: Geological Society of America Bulletin v. 71, no. 2, p. 99-126. Barksdale, J.D., 1975, Geology of the Methow Valley, Okanogan County, Washington: Washington Division of Geology and Earth Resources Bulletin no. 48, 72 p. Tabor, R.W., Frizzell, V.A.,Jr., Booth, D.B., Waitt, R.B., Whetten, J.T., Zartman, R.E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, scale 1:100,000. Tabor, R.W., Frizzell, V.A.,Jr., Whetten, J.T., Waitt, R.B., Swanson, D.A., Byerly, G.R., Booth, D.B., Hetherington, M.J., Zartman, R.E., 1987, Geologic Map of the Chelan 30-Minute by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1661, scale 1:100,000.
NGMDB product	NGMDB product page for 30777
Counties	Chelan - Douglas - King - Kittitas - Okanogan - Skagit - Snohomish - Whatcom

State

Washington

Name

Paleocene-Cretaceous nonmarine rocks

Geologic age

Eocene (see age coding)

Lithologic constituents

Major

Sedimentary > Clastic > Sandstone > Arkose (Bed)Also includes minor tuffaceous sandstone.

Minor

Sedimentary > Clastic > Mudstone > Shale (Bed)

Sedimentary > Clastic > Conglomerate (Bed, Lens)

Incidental

Sedimentary > Clastic > Siltstone (Bed)

Sedimentary > Coal (Bed)

Igneous > Volcanic (Pyroclastic-tuff)

Comments

Two polygons on the digital coverage are tagged as TKc (the original name of this unit). Chumstick formation is usually referred to as Swauk formation but is younger in age (middle Eocene as opposed to early Eocene) (Tabor and others, 1987).

Stratigraphic units

Chuckanut Formation; Guye Formation; Pipestone Canyon Formation; Swauk Formation; Chumstick formation

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.

Easterbrook, D.J., 1976b, Geologic Map of Western Whatcom County, Washington: U.S. Geological Survey Miscellaneous Investigations Series Map I-854-B, scale 1:62,500.

https://pubs.er.usgs.gov/publication/i854B

Misch, P., 1977, Bedrock Geology of the North Cascades, in Brown, E. H. and Ellis, R. C. (eds.), Geological Excursions in the Pacific Northwest, Geological Society of America 1977 Annual Meeting, Seattle: Western Washington University, p. 1-62.

Foster, R.J., 1960, Tertiary Geology of a Portion of the Central Cascade Mountains, Washington: Geological Society of America Bulletin v. 71, no. 2, p. 99-126.

Barksdale, J.D., 1975, Geology of the Methow Valley, Okanogan County, Washington: Washington Division of Geology and Earth Resources Bulletin no. 48, 72 p.

Tabor, R.W., Frizzell, V.A.,Jr., Booth, D.B., Waitt, R.B., Whetten, J.T., Zartman, R.E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, scale 1:100,000.

Tabor, R.W., Frizzell, V.A.,Jr., Whetten, J.T., Waitt, R.B., Swanson, D.A., Byerly, G.R., Booth, D.B., Hetherington, M.J., Zartman, R.E., 1987, Geologic Map of the Chelan 30-Minute by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1661, scale 1:100,000.

NGMDB product

NGMDB product page for 30777

Counties

Chelan - Douglas - King - Kittitas - Okanogan - Skagit - Snohomish - Whatcom