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Jean Louis Rodolphe Agassiz (1807-1873), Swiss- American palaeontologist and glaciologist. One of the foremost scientists of the 19th century, he established his name through a systematic study of fossil fish which he published between 1833 and 1844 in a five volume work. Agassiz is also remembered for his work on glaciation where he showed conclusively that glaciers advanced and retreated over time. He is generally credited with the discovery of the ice ages. However he was a staunch believer in the immutability of species, and was Darwin's main opponent in the USA. He is now critizied for his views concerning the position of blacks in American society.
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