Principles of Geology: An Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes now in Operation

In 1833, Charles Lyell published the final volume of his pioneering trilogy, which Charles Darwin took with him on the Beagle. In it, Lyell describes the composition of the Earth's crust, examines shell fossils, and explains rock stratification, separating geological formations into three periods – primary, secondary and tertiary. He chastises his fellow geologists for preferring to speculate on the possibilities of the past rather than exploring the realities of the present, and shows his ...