The Timbered Hills Group unconformably overlies the igneous basement in Oklahoma and consists of two formations, the lower Reagan, and the upper Honey Creek. With the exception of the highest "hills," the Reagan Sandstone covers the eroded Carlton Rhyolite in southwestern Oklahoma and various other igneous rocks throughout the rest of the state. It grades up from nonmarine sands to marine sands, capped by a widespread glauconitic "greensand." The Honey Creek conformably overlies the Reagan and unconformably overlies all but the highest remaining hills of the igneous substrate. It is composed of interbedded pelmatozoan grainstones and quartz sands, which grade up into the pure carbonates of the overlying Arbuckle Group. Evaluation of published field data indicates that the physical features of the two formations can be explained readily within the framework of the Genesis Flood. The Reagan contains the boundary between the freshwater and marine phases of the early Flood. The Honey Creek marks the transition from clastic deposition to the continent-scale North American carbonate platform that apparently formed early in the Flood.