Mesozoic alkali intrusive rocks

Albite granite as small plugs and sills near Boundary in Stevens County.
State Washington
Name Mesozoic alkali intrusive rocks
Geologic age Likely Eocene
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granite (Dike or sill, Stock or pipe)
Stratigraphic units Sheppard granite (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.

Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000.

Yates, R.G. and Engels, J.C., 1968, Potassium-Argon Ages of Some Igneous Rocks in Northern Stevens County, Washingon: U. S. Geological Survey Professional Paper 600-D, p. D242-D247.

Joseph, N.L., 1990a, Geologic Map of the Colville 1:100,000 Quadrangle, Washington-Idaho: Washington Division of Geology and Earth Resources Open File Report 90-13, 78 p., 1 pl.

NGMDB product
Counties Stevens