![]() Lithologically the formation is divisible into two members: a lower unit, from 1.5 to 20 m (5 to 65 ft) thick, of light gray or brightly colored kaolinitic strata herein designated the Bear Den Member and an upper unit, as much as 45 m (150 ft) thick, of yellow to tan illitic to montmorillonitic strata herein designated the Camels Butte Member. The maximum thickness of the formation in the scattered erosional remnants in which it still persists is 55 m (180 ft). The Golden Valley Formation consists of claystone, mudstone, siltstone, micaceous sandstone, and lignite deposited under predominantly fluvial conditions during late Paleocene and early Eocene time in the Williston basin of North Dakota.
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