Abstract
To attempt a thoroughgoing logical classification of sedimentary rocks is beyond the scope of this article. Unless Grabau's compounding of prefixes into one dinosaurian term is deemed objectionable, his classification can scarcely be bettered. Here only two lines of suggestion are offered. One aims at systematizing field descriptions of rocks. The other deals with problems of nomenclature which chiefly arose during the writer's examination of three hundred specimens and eighty thin sections of the so-called Deadwood formation in the Bighorn Mountains, Wyoming.
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