The Virgelle Sandstone is a geologic formation overlain by the
Two Medicine Formation
The Two Medicine Formation is a geological formation, or rock body, in northwestern Montana and southern Alberta that was deposited between 82.4 Ma and 74.4 Ma, during Campanian (Late Cretaceous) time. It crops out to the east of the Rocky Mountai ...
.
["Geological Setting," Trexler (2001); pages 300-301.] It formed from the beach sands exposed on northern and western shores of the receding
Colorado Sea.
Footnotes
References
* Trexler, D., 2001, Two Medicine Formation, Montana: geology and fauna: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 298–309.
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Sandstone formations of the United States
Cretaceous Montana