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Books Books 1 - 1 of 1 on Cretaceous ages lie against the granite core at an angle of about thirty degrees....
" Cretaceous ages lie against the granite core at an angle of about thirty degrees from the horizontal, while the rocks of Tertiary age abut against and overlap the edges of the Cretaceous. (See Section on Plate IV.) EVIDENCES OF OIL Along the outcrops... "
Prospective Oil Fields at Upton, Weston County, Buck Creek, Niobrara County ... - Page 9
by Loyal Wingate Trumbull - 1913 - 15 pages
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Geological Survey Bulletin, Issues 1352-1357

Geology - 1972
...Mountains, in southwest Natrona County. Along the outcrops of Cretaceous rocks (from Dakota to Mesaverde) deposits of asphaltum mark the location of former oil springs, and at many places oil-saturated sandstones form prominent ridges. The oil seepages and springs of the Rattlesnake region...
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