To: Geologists of the U. S. Geological Survey

From: Chief geologist

As recommended by the Geologic Names Committee and approved by me, the following series subdivisions of the Mississippian and Pennsylvanian systems have been adopted in the official nomenclature of the U. S. Geological Survey.

This action does not change the classification of Carboniferous systems used in the official nomenclature to include Mississippian system and Pennsylvanian system, as provided for in my memorandum of May 14, 1953.3

The American Association of Petroleum Geologists announces the award of grants-in-aid of research to the following.

Manuel N. Bass,...

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