The results of his unaided labors were submitted to the American Philosophical Society in a memoir entitled Observations on the Geology of the United States explanatory of a Geological Map, and published in the Society's Transactions, together with the nation's first geological map. Almost every state in the Union was traversed and mapped by him the Allegheny Mountains being crossed and recrossed some 50 times.
In 1807, Maclure commenced the self-imposed task of making a geological survey of the United States. The first geological map of the United States was produced in 1809 by William Maclure. (1874 - ) Photographer: William Henry Jackson Geological and Geographic Survey of the Territories.
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