Pre-Middle Jurassic volcanic rocks, undivided (WApJv;0)

State	Washington
Name	Pre-Middle Jurassic volcanic rocks, undivided
Geologic age	Early Cretaceous-Late Jurassic
Lithologic constituents	Major Metamorphic > Metaigneous > Greenstone (Greenschist) Minor Metamorphic > Metaigneous > Metavolcanic (Greenschist)Includes spilite, keratophyre, meta-basalt breccia and tuff, and metamorphosed andesite. Incidental Metamorphic > Amphibolite (Greenschist) Sedimentary > Clastic > Sandstone > Graywacke (Bed) Igneous > Plutonic > Dioritic > Diorite (Dike or sill) Metamorphic > Metasedimentary > Metaclastic > Slate Metamorphic > Metasedimentary > Metaclastic > Argillite
Comments	Spilitic volcanic rocks include meta-basalt flows, breccia, and tuff, as well as metamorphosed andesite and keratophyre (Tabor and others, 1982, Southwick, 1974). Outcrop in central Washington defined as part of Ingalls Tectonic Complex by Tabor and others, 1982. Huntting and others, 1961, lists "Hawkins" in the WApJph unit but I think it is more appropriately included in this unit (see maps and lithology descriptions of Tabor and others, 1982, and Southwick, 1974); all rocks in this formation are greenschist facies. Slate, argillite, and graywacke are part of the Peshastin formation.
Stratigraphic units	Ingalls Tectonic Complex (Hawkins formation, Peshastin formation (in part))
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. Tabor, R.W., Waitt, R.B.,Jr., Frizzell, V.A.,Jr., Swanson, D.A., Byerly, G.R., Bentley, R.D., 1982, Geologic Map of the Wanatchee 1:100,000 Quadrangle, Central Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1311, scale 1:100,000. Southwick, D.L., 1974, Geology of the Alpine-type Ultramafic Complex and Mount Stuart, Washington: Geological Society of America Bulletin, v. 85, no. 3, p 391-402. 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.
NGMDB product	NGMDB product page for 30777
Counties	Chelan - Kittitas - Skagit

State

Washington

Name

Pre-Middle Jurassic volcanic rocks, undivided

Geologic age

Early Cretaceous-Late Jurassic

Lithologic constituents

Major

Metamorphic > Metaigneous > Greenstone (Greenschist)

Minor

Metamorphic > Metaigneous > Metavolcanic (Greenschist)Includes spilite, keratophyre, meta-basalt breccia and tuff, and metamorphosed andesite.

Incidental

Metamorphic > Amphibolite (Greenschist)

Sedimentary > Clastic > Sandstone > Graywacke (Bed)

Igneous > Plutonic > Dioritic > Diorite (Dike or sill)

Metamorphic > Metasedimentary > Metaclastic > Slate

Metamorphic > Metasedimentary > Metaclastic > Argillite

Comments

Spilitic volcanic rocks include meta-basalt flows, breccia, and tuff, as well as metamorphosed andesite and keratophyre (Tabor and others, 1982, Southwick, 1974). Outcrop in central Washington defined as part of Ingalls Tectonic Complex by Tabor and others, 1982. Huntting and others, 1961, lists "Hawkins" in the WApJph unit but I think it is more appropriately included in this unit (see maps and lithology descriptions of Tabor and others, 1982, and Southwick, 1974); all rocks in this formation are greenschist facies. Slate, argillite, and graywacke are part of the Peshastin formation.

Stratigraphic units

Ingalls Tectonic Complex (Hawkins formation, Peshastin formation (in part))

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.

Tabor, R.W., Waitt, R.B.,Jr., Frizzell, V.A.,Jr., Swanson, D.A., Byerly, G.R., Bentley, R.D., 1982, Geologic Map of the Wanatchee 1:100,000 Quadrangle, Central Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1311, scale 1:100,000.

Southwick, D.L., 1974, Geology of the Alpine-type Ultramafic Complex and Mount Stuart, Washington: Geological Society of America Bulletin, v. 85, no. 3, p 391-402.

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.

NGMDB product

NGMDB product page for 30777

Counties

Chelan - Kittitas - Skagit