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"The part of this report dealing with Idaho and Utah is based on work done on behalf of the U.S. Atomic Energy Commission; that dealing with Montana was prepared as part of the program of the Department of the Interior for development of the Missouri River basin and on behalf of the U.S. Atomic Energy Commission. The report is published with the permission of the Commission."

Geology, Stratigraphic --- Phosphate rock --- From 230 to 280 million years ago --- Phosphoria Formation. --- Utah. --- Idaho. --- Montana.