Biennial Report of the Progress of the Geological Survey of Michigan ... 1
Biennial Report of the Progress of the Geological Survey of Michigan ... 1
Michigan. Geological Survey, Alexander Winchell
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The amount of paraflBne, however, is said to be less, and the residue left from distillation is, unlike that from peat, com- paratively worthless. A yield of five per cent of bituminous matter qualifies the shales in France to be ecuncjmically worked. The yield of our shales has never been accurately ascertained^ STATE GEOLOGIST. m and I have n« means at my disposal for the determiBation of Ihese important questioms. Shales thus bituminized have an existence in our State, abosi which there can ...be no question. I have elsewhere expressed the hope that they will yet be found to yield a spontaneous flow of Petroleum, like those of neighboring districts. The belt of country along which experiments might be made extends from Wayfie county to Port Huron, and from Thunder to Grand Traverse Bay. The geological relations and the surface indi- cations are such, especially along the southern belt, that a few borings would be fully justified. A few years ago, as I am in- formed by Mr. F. P. Bouteller, a boring for water was under- taken beneath a saw mill in the township of Greenfield.
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