Many ancient clam and snail shells have been found around the shoreline of Bear Lake. Local residents have at times gathered the shells as a source of calcium for their chickens. These shells are well preserved and have been dated to be 10,000 years old (Smart, 1963). Curators at the Smithsonian Institute identified all 6 species of snail and one species of clam. Carbon dating performed by Columbia University estimated shells gathered from the Ideal Beach area of Bear Lake to be 12,000 years old....
Palacios, Patsy; Luecke, Chris; and Robinson, Justin
"Paleo-biology and paleo-hydrology of the Bear Lake Basin, Utah,"
Natural Resources and Environmental Issues:
Vol. 14, Article 17.
Available at: http://digitalcommons.usu.edu/nrei/vol14/iss1/17