St. Mary River formation (MTKsm;0)

State	Montana
Name	St. Mary River formation
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Ksm
Primary rock type	mudstone
Secondary rock type	sandstone
Other rock types	limestone
Lithologic constituents	Major Sedimentary > Clastic > Mudstone (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Incidental Sedimentary > Carbonate > Limestone (Bed)
Map references	Ross, P.R., Andrews, D.A., and Witkind, I.J., 1955, Geologic map of Montana: U.S. Geological Survey, 2 sheets, scale 1:500,000.
Unit references	Witkind, I.J., 1972, Geologic map of the Henrys Lake quadrangle, Idaho and Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I-781-A, scale 1:62,500. [http://pubs.er.usgs.gov/publication/i781A] Viele, G.W. and Harris, F.G., III, 1965, Montana Group stratigraphy, Lewis and Clark County, Montana: American Association of Petroleum Geologists Bulletin, v. 49, no. 4, p. 379-417. Stebinger, E., 1914, Titaniferous magnetite beds on the Blackfeet Indian Reservation, Montana: U.S. Geological Survey Bulletin 540, p. 329-337. [http://pubs.er.usgs.gov/publication/b540] Schmidt, R.G., 1972, Geologic map of the Coburn Mountain quadrangle, Lewis and Clark and Cascade Counties, Montana: U.S. Geological Survey Geologic Quadrangle Map GQ-975, 1 sheet, scale 1:24,000. [http://pubs.er.usgs.gov/publication/gq975]
Geographic coverage	Glacier - Lewis and Clark - Pondera