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Belt Series of Northwestern Montana by Steven D Theodosis
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9 o'clock Amer anticline Banff basal Bearpaw Bearpaw shale beds Blackleaf Bull Butte calcareous Cambrian central Montana chert Cobban Colorado shale correlation Creek formation Dakota dark Deiss deposits Devonian Disturbed Belt dolomite drilled east equivalent exposed fauna feet thick figs flank fold fossils Geological Glacier gray Horsethief sandstone igneous interbedded Jurassic Kevin-Sunburst Dome Kootenai formation Lake Lewis Overthrust limestone Little Belt Mountains Lodgepole lower Madison limestone marine Mary River Mary River formation Medicine formation miles Milk River Mission Canyon Mississippian Montana northern northwest northwestern Montana Oil and Gas outcrops overlain overlying Pondera Rierdon road cut rocks Rocky Mountain sand sandstone sandy Saskatchewan Sawtooth Range sediments siltstone Stebinger strata stratigraphic structural Sun River Sunburst Sweetgrass Arch syncline Teton thin thrust fault tion U. S. Geol U. S. Highway unconformity unit Upper Cretaceous valley Virgelle sandstone western Williston basin Willow Creek zone