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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