Sentinel Butte State Nature Preserve

Location - (Map It)

located 3 miles south of the town of Sentinel Butte


Sentinel Butte is believed to be named for two Arikaree Indian sentinels or scouts (American Black Eagle and Standing Together) who were slain in this area. The butte has been carved from rock strata of the Sentinel Butte Formation of which the top 80 feet are sandstone. Topping the sandstone on each mesa is a layer of soft white to grey limestone and clay. These rock beds, referred to as the White River Formation, contain the fossil fish that are object of protection of the nature preserve.