In 1943, the writer summarized the results of three seasons of field work devoted primarily to detailed correlation of lignite and other beds and to reconnaissance mapping in western North Dakota.2 Roland W. Brown of the United States Geological Survey in a recent paper3 has taken issue with certain of these correlations and has labelled others as “pretty well compounded with guess work.”

When the writer began work in North Dakota in 1940, he had the benefit of 40 years of experience in mapping surface geology, 16 years of which were spent in successfully tracing and correlating coal...

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