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On the contrary, there is a great deal to be said in favour. In the course of summing up his results, M. Filhol observes: "During the epoch of the phosphorites, great changes took place in animal forms, and almost the same types as those which now exist became defined from one another.
Leidy, Marsh, and Cope, on the fossils of the Western Territories of America, have appeared almost wholly since 1870, those of M. Filhol on the phosphorites of Quercy in 1878.
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