During 1976, the American Association of Petroleum Geologists undertook the ambitious task of preparing a new set of stratigraphic correlation charts for the United States. The project named “Correlation of Stratigraphic Units of North America,” or COSUNA for short, was as needed as it was ambitious. The last comprehensive set of stratigraphic correlation charts had been published by the Geological Society of America between 1942 and 1960. The charts were in urgent need of revision.

Orlo E. Childs accepted the post of project director, and a Steering Committee was created that included representatives from the American Association of Petroleum Geologists,...

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