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Greenhorn Formation and Belle Fourche and Mowry Shale

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.
StateWyoming
NameGreenhorn Formation and Belle Fourche and Mowry Shale
Geologic agePhanerozoic | Mesozoic | Cretaceous-Early
Original map labelKgbm
Primary rock typemixed clastic/carbonate
Secondary rock typefine-grained mixed clastic
Other rock typesmixed 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.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Geographic coverageCrook - Niobrara - Weston

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