Cambrian phyllite

Predominantly gray-green, banded phyllite, some sericite schist, abundant thin beds of quartzite, especially in lower part of unit, and limestone in upper part; northern Pend Oreille County. Much the same lithology but more conspicuous subunits of quartzite, limestone, and schist in northeastern Stevens County. Gray phyllite, greenish argillite, andalusite schist, minor inerbedded quartzite and siliceous dolomite, especially in lower part, and much gray limestone in upper part; north-central Stevens County. Limestone bed in lower part of unit contains Lower Cambrian fossils (Archaeocyathus).
State Washington
Name Cambrian phyllite
Geologic age Cambrian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Incidental
Metamorphic > Schist
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Metamorphic > Metasedimentary > Metacarbonate > MarbleRecrystallized limestone at base of phyllite.
Stratigraphic units Maitlen Phyllite; Colville Quartzite (in part); Clugston limestone (in part); Chewelah argillite (in part); Monk Formation (Mills 1985)
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.

Park, C.F.Jr., and Cannon, R.S.Jr., 1943, Geology and Ore Deposits of the Metaline Quadrangle, Washington: U. S. Geological Survey Professional Paper 202, 81 p.

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.

Mills, J.W., 1985, Geologic Maps of the Marcus and Kettle Falls Quadrangles, Stevens and Ferry Counties, Washington: Washington Division of Geology and Earth Resources Geologic Map GM-32, scale 1:24,000.

NGMDB product
Counties Pend Oreille - Stevens