Part of the Geologic Map of the Middle and Western States published in Natural History of New York, Part IV, Geology by James Hall 1843, Albany New York. Hall stated, “Dr. Houghton, State Geologist of Michigan, has obligingly furnished me with a geologic map of that state of which I posses a very imperfect knowledge.” The Houghton Manuscript is lost. The map outlines
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Document Date: 2012-12-07 11:38:57

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