Online Encyclopedia

THE BIGHORN MOUNTAINS OF WYOMING

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Originally appearing in Volume V27, Page 631 of the 1911 Encyclopedia Britannica.
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THE BIGHORN MOUNTAINS OF WYOMING Cretaceous. De Smet formation (shale and sandstone) . 4000 ft. Kingsbury conglomerate . . . 0-1500 „ Piney formation (shale and sandstone) 2500 „ Parkman sandstone 350 „ Pierre shale 1500-3500 „ Colorado formation 1050-1700 „ Comanchean. Cloverly formation (upper part may be Cretaceous) 30- 300 ft. Morrison formation (may be Jurassic) too- 300 „ Jurassic. Sundance formation Unconformity. Triassic and Permian. Chugwater formation Pennsylvanian. Tensleep sandstone 30- 150 ft. Amsden sandstone 150- 350 „ Mississippian. Madison limestone I000 ft. Unconformity. Ordovician. Bighorn limestone 300 ft. Unconformity. Cambrian (Upper). Deadwood formation . .. Unconformity. Pre-Cambrian. Granites. This section is fairly representative for the Rocky Mountains.
End of Article: THE BIGHORN MOUNTAINS OF WYOMING
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