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Siyeh limestone

Siyeh limestone: crystalline limestone of varying impurity; mostly thick bedded or massive, but with thin wavy banding on fresh fractures within the beds; dusky blue or greenish where fresh, weathering orange and brownish; "molar tooth", similar structures, and stromatolites are common.
NameSiyeh limestone
Geologic ageProterozoic | Mesoproterozoic
Original map labelpCsi
CommentsAn obsolete stratigraphic name, now replaced by Helena Formation. Apparently only used in MT originally within Glacier National Park.
Primary rock typecarbonate
Secondary rock typequartzite
Other rock typesmeta-argillite
Lithologic constituents
Sedimentary > Carbonate (Bed)Weakly metamorphosed limestone and dolomite.
Metamorphic > Metasedimentary > Metaclastic > Argillite (Greenschist)
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Greenschist)
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
Lopez, D.A., 2001, Geologic map of the Chester 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open File Report 445, 4 p., scale 1:100,000.
Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1° x 2° quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Series Map I-2593, scale 1:250,000.
Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of Kalispell 1° x 2° quadrangle, Montana and Alberta, British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-2267, scale 1:250,000.
McGill, G.E., and Sommers, D.A., 1967, Stratigraphy and correlation of the Precambrian Belt Supergroup of the southern Lewis and Clark Range, Montana: Geological Society of America Bulletin, v. 78, no. 3, p. 343-351.
Harrison, J.E., 1972, Precambrian Belt basin of northwestern United States--Its geometry, sedimentation and copper occurrences: Geological Society of America Bulletin, v. 83, no. 5, p. 1215-1240.
Whipple, J.W., 1992, Geologic map of Glacier Park, Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I-1508-F, 1 sheet, scale 1:100,000.
Whipple, J.W., Connor, J.J., Raup, O.B., and McGimsey, R.G., 1984, Preliminary report on the stratigraphy of the Belt Supergroup, Glacier National Park and adjacent Whitefish Range, Montana, in McBane, J.D., and Garrison, P.B., eds., Northwest Montana an
Earhart, R.L., Mudge, M.R., and Connor, J.J., 1984, Belt Supergroup lithofacies in the Northern Disturbed Belt, northwest Montana, in McBane, J.D., and Garrison, P.B., eds., Northwest Montana and adjacent Canada--Montana Geological Society 1984 Field Con
CountiesFlathead - Glacier

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