Tertiary-Cretaceous basic intrusive rocks (WATKbi;0)

State	Washington
Name	Tertiary-Cretaceous basic intrusive rocks
Geologic age	Cretaceous-Jurassic
Lithologic constituents	Major Igneous > Plutonic > Gabbroic > GabbroIncludes metagabbro. Igneous > Plutonic > Dioritic > DioritePrimarily metadiorite. Possibly major in rank. Minor Metamorphic > Metaigneous > GreenstonePossibly major in rank. Incidental Sedimentary > Clastic > Sandstone (Bed) Igneous > Plutonic > Granitic > Tonalite Metamorphic > Metasedimentary > Metaclastic > Argillite Metamorphic > Gneiss Igneous > Plutonic > Ultramafic > Hornblendite Metamorphic > Amphibolite
Comments	Tabor and others, 1993, maps this as greenstone and metadiabase with metagabbro, argillite, and sandstone, and may include metatonalite, gabbro, flasar gneiss, amphibolite and hornblendite. Similarly mapped as such by Dragovich and others, 2002. Because greenstone is mentioned first in the above descriptions, I am assuming that it is more prevalent than metadiabase with the caution that the referenced literature does not explicitly say this is the case. This unit is considered part of the Western melange belt.
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., 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. 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	Snohomish

State

Washington

Name

Tertiary-Cretaceous basic intrusive rocks

Geologic age

Cretaceous-Jurassic

Lithologic constituents

Major

Igneous > Plutonic > Gabbroic > GabbroIncludes metagabbro.

Igneous > Plutonic > Dioritic > DioritePrimarily metadiorite. Possibly major in rank.

Minor

Metamorphic > Metaigneous > GreenstonePossibly major in rank.

Incidental

Sedimentary > Clastic > Sandstone (Bed)

Igneous > Plutonic > Granitic > Tonalite

Metamorphic > Metasedimentary > Metaclastic > Argillite

Metamorphic > Gneiss

Igneous > Plutonic > Ultramafic > Hornblendite

Metamorphic > Amphibolite

Comments

Tabor and others, 1993, maps this as greenstone and metadiabase with metagabbro, argillite, and sandstone, and may include metatonalite, gabbro, flasar gneiss, amphibolite and hornblendite. Similarly mapped as such by Dragovich and others, 2002. Because greenstone is mentioned first in the above descriptions, I am assuming that it is more prevalent than metadiabase with the caution that the referenced literature does not explicitly say this is the case. This unit is considered part of the Western melange belt.

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., 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.

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

Snohomish