Lake Bonneville became the largest pluvial lake in the western hemisphere about 17,000 to 15,000 years ago, when it covered nearly 52,000 square kilometers in Nevada, Utah, Idaho, and Wyoming. Former lake levels of Lake Bonneville are indicated by shorelines, deltas, bars, and wavecut niches in bedrock, as well as sedimentary deposits of gravel, sand, silt, and clay. Four distinct strand lines have been recognized: the pre-Bonneville strand at 5100 feet altitude, the Bonneville strand at 5135 feet, the Provo at 4800 feet, and the Stansbury at 4500 feet. Lacustrine deposits which record Lake Bonneville's history contain many unconformities, were removed during coastline migrations, or exist in discontinuous and degraded patches. The stratigraphy and history of Lake Bonneville remain uncertain.
Sources
From pp. 300-302 in Morison, R. B. 1991. "Quaternary stratigraphic, hydrologic, and climatic history of the Great Basin, with emphasis on Lakes Lahontan, Bonneville, and Tecopa." Chapter 10 in Quaternary Non-glacial Geology: Conterminous United States. Volume K-2 in The Geology of North America series. Boulder, CO: Geological Society of America.
From pp. 484-487 in Thornbury, William D. 1965. Regional Geomorphology of the United States. New York: Wiley.