Madison Group and Darby Formation (TB, N) or Madison Group and Three Forks and Jefferson Formations (Y) (WYMD;0)

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.

State	Wyoming
Name	Madison Group and Darby Formation (TB, N) or Madison Group and Three Forks and Jefferson Formations (Y)
Geologic age	Phanerozoic \| Paleozoic \| Devonian-Late Carboniferous Mississippian-Early(?) Mississippian-Middle(?) Mississippian-Late
Original map label	MD
Primary rock type	limestone
Secondary rock type	dolostone (dolomite)
Other rock types	mudstone
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. [http://pubs.er.usgs.gov/publication/ofr83802]
Unit references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Geographic coverage	Big Horn - Fremont - Hot Springs - Johnson - Lincoln - Park - Sheridan - Sublette - Teton - Washakie