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Start Over Subjects Michigan ✖Remove constraint Subjects: Michigan Titles A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society ✖Remove constraint Titles: A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society Dates by Range 1800-1849 ✖Remove constraint Dates by Range: 1800-1849

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  • A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society1