Precambrian conglomerate (WApCAc;0)

Gray-brown, coarse, poorly sorted pebbles and cobbles of limestone, dolomite, reddish-brown quartzite, black slate or phyllite, and rarely granitic rocks in a gray sandy phyllite matrix; northeastern Pend Oreille County and southwestern Stevens County. Rocks become finer grained and more schistose and the unit becomes thicker toward the southwest, where there is included an isolated subunit which may be a tillite, consisting of cobbles, boulders, and blocks of argillite and carbonate rocks in a fine silty matrix.

State	Washington
Name	Precambrian conglomerate
Geologic age	Late-Proterozoic
Original map label	PCc
Primary rock type	conglomerate
Secondary rock type	meta-conglomerate
Other rock types	phyllite; dolostone (dolomite); greenstone; sandstone; schist; quartzite
Lithologic constituents	Major Sedimentary > Clastic > Conglomerate (Bed)Includes meta-conglomerate. Minor Metamorphic > PhylliteRank based on mapping by Joseph, 1990a, b. Incidental Sedimentary > Clastic > Sandstone (Bed) Metamorphic > Greenstone (Greenschist) Sedimentary > Carbonate > Dolostone (Bed)Possibly occurrance of limestone as well (Joseph, 1990a, b). Metamorphic > Quartzite Metamorphic > Schist
Map references	Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.
Unit references	Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., 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. [http://pubs.er.usgs.gov/publication/pp202] 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. 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. Joseph, N. L., 1990b, Geologic Map of the Nespelem 1:100,000 Quadrangle, Washington: Washington Division of Geology and Earth Resources Open File Report 90-16, 47 p., 1 pl.
Geographic coverage	Pend Oreille - Stevens