As a logical sequel to review of the classification of Permian rocks9 by a subcommittee on the Permian, the Association committee on geologic names and correlations at its March, 1940, meeting directed that a similar investigation and report be made of the classification of the Mississippian and Pennsylvanian. Geologists at that time were confronted with the choice of

Pennsylvanian age are more appropriately classified as two independent geologic systems and geologic periods, the term Carboniferous being either archaic or of use only where these rocks are not differentiated.

This third choice has for many years been advocated by some...

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