Abstract
The Foremost formation consists of continental material deposited during a regression of the Montana sea. Three important members are identified. The Pakowki formation is described as the marine sediments of a transgressing Montana sea. Details of local sections are given and it is shown that the sea transgressed from the southeast. The two divisions of the Milk River formation are described as the regressional deposits of the retreating Colorado sea. The upper part was derived from a land mass southwest of the area.
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