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Image source: Scrope, George Poulett (1797-1876). Memoir on the geology of central France; including the volcanic formations of Auvergne, the Velay, and the Vivarais. London: Printed for Longman, Rees, Orme, Brown, and Green, 1827

Vulcan's Forge and Fingal's Cave

Volcanoes, Basalt, and the Discovery of Geological Time

Section XI. Basalt in Saxony

The theory of the volcanic origin of basalt was fairly widespread in France and Italy in the late eighteenth century, and even in Western Germany. But it ran into some trouble in eastern Germany, especially in Saxony. One difficulty was presented by the basalt deposits in Saxony, which frequently lie in horizonal beds between sedimentary strata, or as caps on the top of isolated rises. With no volcanic cones in evidence, it is more difficult to argue for an igneous origin for basalt. A second problem was presented by the foremost geological authority in Saxony at that time, Abraham Werner. Werner came to champion an aqueous origin for basalt, and he influenced many others who followed his lead.

The illustration, showing a basalt outcrop in Saxony, is from exhibit item 34.

Basalt outcrop. Image source: LLeske, Nathanael Gottfried. Reise durch Sachsen in rüksicht der naturgeschichte und ökonomie unternommen und beschrieben. Leipzig: in der J.G. Müllerschen Buchhandlung, 1785, pl. 22.

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