The selachians found in the Shotgun Member of the Fort Union Formation indicate that the waters in which the deposits were formed were saline. The suggestion is made that during middle and possibly late Paleocene a remnant of the Cannonball Sea prevailed in the western Plains region. It is postulated that periodic flooding from the Cannonball Sea of parts of the Wind River basin took place to produce significant salinity to support a selachian fauna in Waltman Lake.

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