In the development of the North Central Texas oil fields there are two terms that have been extensively used, the “Pennsylvanian formation” and the “Bend formation.” The first term has been used in many ways. To some the Pennsylvanian implies great possibilities, and the value of a lease is greatly enhanced if it can be shown that it is within the area of the Pennsylvanian formations as indicated on the geologic map of the Bureau of Economic Geology & Technology. Those who are engaged in actual geologic field work are not so enthusiastic, especially when he hears the term Pennsylvanian...
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