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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

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WYOMING  Cretaceous . De Smet formation (shale and
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sandstone) . 4000 ft . Kingsbury
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conglomerate . . . 0-1500 „ Piney formation (shale and sandstone) 2500 „
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Parkman sandstone 350 „
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Pierre shale 1500-3500 „
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Colorado formation 1050-1700 „ Comanchean . Cloverly formation (upper
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part may be Cretaceous) 30- 300 ft .
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Morrison formation (may be
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Jurassic) too- 300 „ Jurassic . Sundance formation Unconformity . Triassic and
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Permian . Chugwater formation Pennsylvanian . Tensleep sandstone 30- 150 ft .

Amsden sandstone 150- 350 „ Mississippian .

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Madison
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limestone
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I000 ft . Unconformity . Ordovician . Bighorn limestone 300 ft . Unconformity .
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Cambrian (Upper) .
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Deadwood formation . . . Unconformity . Pre-Cambrian . Granites .

This

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section is fairly representative for the Rocky Mountains .

End of Article: THE BIGHORN MOUNTAINS OF WYOMING
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