This report describes the development of a three-dimensional geologic framework model for a 500 square kilometer (190 square mile) region encompassing the Huntertown Aquifer System in northern Allen County, Indiana. The model presents a geologically realistic depiction of sediments distributed as morphosequences of facies deposited in subglacial and in proglacial settings. A primary objective of this work was to develop an explicit 3-D geologic framework model that could also serve as a hydrostratigraphic framework for future hydrogeologic applications. Additional supporting data files (three-dimensional solid model, geodatabase of model layers, and other maps and borehole data) are available for this open-file study.