Editing Timeline of geology (section)

==19th century==
* 1809 – [[William Maclure]] conducts the first geological survey of the eastern United States
* 1813 – [[Georges Cuvier]] publishes his ''Essay on the Theory of the Earth'', proposing [[catastrophism]] on the basis of his work in [[biostratigraphy]]
* 1830 – Sir [[Charles Lyell]] publishes book, Principles of Geology, which describes the world as being several hundred million years old
* 1837 – [[Louis Agassiz]] begins his glaciation studies which eventually demonstrate that the Earth has had at least one [[ice age]]
* 1841 – [[August Breithaupt]], ''Vollstandiges Handbuch der Mineralogie''
* 1848 – [[James Dwight Dana]], ''Manual of Mineralogy''
* 1862 – [[Lord Kelvin]] attempts to find the age of the Earth by examining its cooling time and estimates that the Earth is between 20 and 400 	million years old
* 1884 – [[Marcel Alexandre Bertrand]], [[Nappe]] and [[Thrust fault]] theory