At a recent informal gathering of geologists in Dallas, the question was raised as to whether any metamorphic rock properties other than the fixed carbon ratios of coals could be used in the same general way as the fixed ratios, to judge of the petroleum possibilities of a given rock formation. Since this is a subject which has undoubtedly arisen in the minds of many of us, a few remarks may not be amiss here.

The fact that a more or less definite relation exists between the character of petroleum in its native state and the degree of metamorphism to...

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