Greenhorn Formation and Belle Fourche and Mowry Shale (WYKgbm;0)

GREENHORN FORMATION AND BELLE FOURCHE AND MOWRY (Kmr) SHALE. GREENHORN FORMATION--Light-colored limestone, marl, and limy sandstone interbedded with gray concretionary shale. BELLE FOURCHE SHALE--Black soft bentonitic concretionary shale. MOWRY SHALE (AGE 94 TO 98 Ma)--Silvery-gray hard siliceous shale containing abundant fish scales and bentonite beds.

State	Wyoming
Name	Greenhorn Formation and Belle Fourche and Mowry Shale
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Early
Original map label	Kgbm
Primary rock type	mixed clastic/carbonate
Secondary rock type	fine-grained mixed clastic
Other rock types	mixed clastic/volcanic
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale Minor Sedimentary > Clastic > Sandstone Unconsolidated > Marl Sedimentary > Carbonate > Limestone Incidental Sedimentary > Clastic > Mudstone > Claystone > Bentonite
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	Crook - Niobrara - Weston