Basic intrusive rocks, undivided (WAbi;0)

State	Washington
Name	Basic intrusive rocks, undivided
Geologic age	Jurassic in central Cascades; Oligocene to Eocene in northern Cascades
Lithologic constituents	Major Igneous > Plutonic > Dioritic > DioriteIncludes hornblende, quartz, and pyroxene diorite. Igneous > Plutonic > Gabbroic > GabbroIncludes uralitized gabbro (greenstone of amphibolite facies) and gabbronorite in northern Whatcom County. Incidental Metamorphic > Metaigneous > Serpentinite
Comments	Diabase (diorite) outcrop in central Cascades (Foster, 1960, Tabor and others, 1982, Dragovich and others, 2002); diorite, including quartz diorite, in Whatcom and Snokomish Counties (Dragovich and others, 2002). Much of the gabbro in central Washington is uralitized (Southwick, 1974).
Stratigraphic units	Ingalls Tectonic Complex (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. 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. 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 - Snohomish - Whatcom

State

Washington

Name

Basic intrusive rocks, undivided

Geologic age

Jurassic in central Cascades; Oligocene to Eocene in northern Cascades

Lithologic constituents

Major

Igneous > Plutonic > Dioritic > DioriteIncludes hornblende, quartz, and pyroxene diorite.

Igneous > Plutonic > Gabbroic > GabbroIncludes uralitized gabbro (greenstone of amphibolite facies) and gabbronorite in northern Whatcom County.

Incidental

Metamorphic > Metaigneous > Serpentinite

Comments

Diabase (diorite) outcrop in central Cascades (Foster, 1960, Tabor and others, 1982, Dragovich and others, 2002); diorite, including quartz diorite, in Whatcom and Snokomish Counties (Dragovich and others, 2002). Much of the gabbro in central Washington is uralitized (Southwick, 1974).

Stratigraphic units

Ingalls Tectonic Complex (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.

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.

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 - Snohomish - Whatcom