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Updated: May 15, 2025
There is a lithologic laboratory in the Survey, with a large corps of lithologists engaged in the microscopic study of rocks. These lithologists are field geologists, who examine the collections made by themselves.
It is a fact that at present there is no part of the world where the discoveries made in this science are of so general importance as here. The Rocky mountains owe their name "to great and widely spread aridity," the mountains being "scantily clothed with vegetation and the indurated lithologic formations rarely masked with soils." But there are many systems of uplifts in this region, and Mr.
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