The Mid-Continent oil fields lie in Kansas, Oklahoma, northern Texas, and northern Louisiana, including also the gas-producing territory of western Arkansas.

The writer has included herewith a map of each of the States under discussion, showing geological boundaries and the locations of the various oil and gas fields. Structure contour sketches are given of typical areas in several districts in order to illustrate the effects of rock folding on oil and gas accumulation.

Output of the Several Fields

For brief comparison, it may not be amiss to call attention to the fact that in 1915 the Mid-Continent fields produced 123,295,867 barrels of petroleum, which lacked only about 17,000,000 barrels of having been half of all the oil produced in the entire United States. Oklahoma led all other States, having exceeded California by over 11,000,000 barrels.

For the purpose of comparing the respective districts of the Mid-Continent region, as they are . . .

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