Geologic Map of the Winnett 30' X 60' Quadrangle, Central Montana 1999, 1993
Geologic Map of the Winnett 30' X 60' Quadrangle, Central Montana 1999, 1993
Montana Bureau of Mines And Geology
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Dark to medium red, gray-green and minor buff-colored silty, blocky weathering shale, and fine- to coarse-grained, chert-bearing, feldspathic, cross-stratified sandstone. Thick basal sandstone (up to 100 ft; Third Cat Creek Sandstone of subsurface) is gray, medium- and coarse-grained, conglomeratic, chert-bearing, cross-stratified. Sandstones higher in section, interbedded with varicolored mudstones, are dominantly yellow and brown, thin-bedded, fine-grained, quartzose with minor chert and feld...spar. Thin gray-white nodular limestone beds occur locally in section above basal sandstone. Thickness of 400-550 ft reported by Gardner (1950). Js JURASSIC SEDIMENTARY ROCKS, UNDIVIDED — Rocks poorly exposed in narrow faulted wedge on southwest side of Black Butte in northwest map area (Goddard, 1988). No thicknesses measured. Ms MISSISSIPPIAN SEDIMENTARY ROCKS, UNDIVIDED — Rocks poorly exposed between two ring faults on southeast flank of Black Butte in northwest map area. Predominant exposures are medium gray weathering Madison Group limestones (Goddard, 1988).
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