Abstract
Lateral changes in lithology of the Cretaceous, Jurassic, Pennsylvanian, and lower Paleozoic rocks indicate conditions favorable for oil and gas occurrence. Cross sections are shown which illustrate the stratigraphy. Maps are used in locating areas where the stratigraphy is significant. End_Page 1105------------------------------ A major wedge-belt of porosity in the Cretaceous rocks is divisible into an upper part containing large accumulations of gas and a lower part relatively untested. Jurassic rocks have three stratigraphic possibilities for oil and gas. Source beds for oil and gas in the Jurassic rocks may be in the overlying marine Cretaceous rocks, the included Wanakah formation, and the locally truncated and overlapped marine Paleozoic sediments. Meager outcrops and well data suggest repeated overlap relations in beds of Pennsylvanian age. These marine units contain coarse clastic facies, which were deposited marginal to positive elements on the north and east sides of the basin. Mississippian and Devonian beds which lie locally above the pre-Cambrian show both primary and secondary features favorable to accumulation. End_of_Article - Last_Page 1106------------
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