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The lacustrine Ridgeland Formation (new name) was deposited during a low stage of Lake Bonneville in northwest Utah and was graded to the Gilbert shoreline. The Gilbert shoreline is about 15 m higher than the level of Great Salt Lake in 1977. The Decker Soil (new name) formed on the Ridgeland Formation and older formations and soils exposed at that time. The Ridgeland probably was deposited during the Holocene in early Neoglacial time. The lake cycle that produced this formation and soil indicates climatic changes that may be pertinent to understanding the modern changes in Great Salt Lake. INTRODUCTION The Ridgeland Formation and Decker Soil, of Holocene age, are herein named. The Ridgeland Formation named for the Ridgeland Canal is of lacustrine origin and is in the upper part of the Lake Bonneville Group (Gilbert, 1875, p. 89; Hunt and others, 1953, p. 17) and at present is only known to exist in the vicinity of Great Salt Lake, Utah. (See fig. 1.) The Decker Soil is named for Decker Creek that begins near the type locality and flows into Decker Lake located approximately 2 km southeast of the former Utah Central Airport. It is typically formed on the Ridgeland Formation but is much more widespread than the Ridgeland because it also formed on all exposed older soils and formations. The reason for naming these thin units is to ease communication in describing the late history of Lake Bonneville and the early history of its successor, the Great Salt Lake. Lake Bonneville was a large lake of late Pleistocene and Holocene age that occupied much of northwestern Utah. It has a very complicated history that includes several cycles that resulted in three prominent and Cl C2 CONTRIBUTIONS TO STRATIGRAPHY 113° 112°

The Holocene Ridgeland Formation and associated Decker Soil (new names) near Great Salt Lake, Utah