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Mineral Resources On-Line Spatial Data

Madison Group and Darby Formation (TB, N) or Madison Group and Three Forks and Jefferson Formations (Y)

MADISON GROUP AND DARBY FORMATION (Thrust Belt, north Wyoming). MADISON GROUP--Group includes Mission Canyon Limestone (blue-gray massive limestone and dolomite), underlain by Lodgepole Limestone (gray cherty limestone and dolomite). DARBY FORMATION--Yellow and greenish-gray shale and dolomitic siltstone underlain by fetid brown dolomite and limestone. MADISON GROUP AND THREE FORKS AND JEFFERSON FORMATIONS (Yellowstone). MADISON GROUP--Group includes Mission Canyon Limestone (blue-gray massive limestone and dolomite), underlain by Lodgepole Limestone (gray cherty limestone and dolomite). THREE FORKS FORMATION--Pink, yellow, and green dolomitic siltstone and shale. JEFFERSON FORMATION--Massive siliceous dolomite.
StateWyoming
NameMadison Group and Darby Formation (TB, N) or Madison Group and Three Forks and Jefferson Formations (Y)
Geologic agePhanerozoic | Paleozoic | Devonian-Late Carboniferous Mississippian-Early(?) Mississippian-Middle(?) Mississippian-Late
Original map labelMD
Primary rock typelimestone
Secondary rock typedolostone (dolomite)
Other rock typesmudstone
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone
Sedimentary > Carbonate > Limestone
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
Map references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Geographic coverageBig Horn - Fremont - Hot Springs - Johnson - Lincoln - Park - Sheridan - Sublette - Teton - Washakie

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