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From Darwin's Journeys: The Making of a Naturalist
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Darwin, Geological Observations
This image shows the geological structure of a South American mountain range that Darwin had observed during his Beagle voyage. Much of Darwin’s early work was devoted to geological subjects, and, early on, he referred to himself as a geologist. It was only after the publication of Origin of Species that he became better known for his biological theories.
Charles Darwin (1809–1882). Geological Observations on South America.... London: Smith, Elder & Co., 1846.
