For roughly 500 million years, during much of the Paleozoic and Mesozoic periods, the Bear Lake Basin was inundated by an inland sea. This sea would retreat and then advance leaving limestone and sandstone deposits scattered around the valley....
Palacios, Patsy; Luecke, Chris; and Robinson, Justin
"Geologic history of the Bear Lake basin,"
Natural Resources and Environmental Issues:
Vol. 14, Article 8.
Available at: http://digitalcommons.usu.edu/nrei/vol14/iss1/8