Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Montana
|Name||Willow Creek formation|
|Geologic age||Phanerozoic | Cenozoic | Cretaceous-Late|
|Original map label||Twc|
|Primary rock type||mudstone|
|Secondary rock type||sandstone|
|Other rock types||limestone; conglomerate|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)I lumped mudstone and shale into this description, because much is described for this unit as "shaly mudstone" or "shale".
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
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.
Witkind, I.J., 1969, Geology of the Teepee Creek quadrangle, Montana-Wyoming: U.S. Geological Survey Professional Paper 609, 101 p., scale 1:62,500.
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