The geology of the Great Smoky Mountain National Park (GSMNP) region of Tennessee and North Carolina was studied from 1993 to 2003 as part of a cooperative investigation with the National Park Service (NPS). This work has been compiled as a 1:100, 000-scale map derived from mapping done at 1:24, 000 and 1:62, 500 scale. The geologic data are intended to support cooperative investigations with NPS, the development of a new soil map by the Natural Resources Conservation Service, and the All Taxa Biodiversity Inventory (http: //www. discoverlifeinamerica. org/). At the request of NPS, we mapped areas previously not visited, revised the geology where stratigraphic and structural problems existed, and developed a map database for use in interdisciplinary research, land management, and interpretive programs for park visitors | Generalized Geologic Map of Bedrock Lithologies and Surficial Deposits in the Great Smoky Mountains National Park Region Tennessee and