Maclure, William; Observations on the Geology of the United States of North America; with remarks on the probable Effects that my be produced by the decomposition of the different classes of rocks on the nature and fertility of soils; applies to the different States of the Union, agreeably to the accompanying geological map. Transactions American Philosophical Society, Vol. 1-New Series 1819. Quarto, pp. xxiv, 101, folded hand-colored map, folded hand colored profiles.
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The work is complete and in a later cloth with black spine titles. The binding is tight and clean, light dust soiling to text margins, text has never been trimmed, map and profile are clean, untrimmed with wide margins. In very good condition.
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Maclure (1763-1840) was a Scottish geologist and statigrapher. He settled in the United States in 1797, traversed much of the eastern part of North America with an eye for the stratigraphy and prepared a colored geological map (the first colored geological map) of the country. The first copy of that work was appeared in 1809. Not satisfied with his abbreviated text and the first edition of his map, Maclure set about gathering new data and after eight years of study, published a much expanded text and a much changed map. He corrected many minor details on the distribution of formations and a much more conspicuous delineation of the Appalachian range. Plate 2 was added which gave five sections across what was at that time the United States from the Atlantic  through the Appalachians and into his Secondary strata of the Mississippi. Many geological historians consider Maclure to be the "Father of American Geology".