arranged fossils and layers of sedimentary rock containing them into time periods, of which the framework remains.

The late 19th century was a period of synthesis, in which geologists attempted to combine all the detail into the big picture. The first of his type, Eduard Suess, used the term "comparative orography" to refer to his method of comparing mountain ranges, parallel to "comparative anatomy" and "comparative philology.

His work preceded plate tectonics and continental drift. This

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