Principles of Geology, Vol. 3 of 3: Being an Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation (Classic Reprint) - Hardcover

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Excerpt from Principles of Geology, Vol. 3 of 3: Being an Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation

The original ms. Of the 'principles of Geology' was delivered to the publisher at the close of the year 1827, when it was proposed that it should appear in the course of the year following, in two volumes octavo. Since that time many causes have concurred to delay the completion of the work, and, in some degree, to modify the original plan. In May, 1828, when the preliminary chapters on the History of Geology, and some others which follow them in the first volume, were nearly finished, I became anxious to visit several parts of the continent, in order to acquire more information concerning the tertiary formations. Accordingly, I set out in May, 1828, in company with Mr. Murchison, on a tour through France and the north of Italy, where we exa mined together many districts which are particularly mentioned in the body of this work. We visited Auvergne, Velay, Cantal, and the Vivarais, and afterwards the environs of Aix, in Provence, and then passed by the Maritime Alps to Savona, thence crossing to Piedmont by the Valley of the Bormida.

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