TY - RPRT TI - Geologic assessment of undiscovered oil and gas resources: Oligocene Frio and Anahuac Formations, United States Gulf of Mexico coastal plain and State waters AU - Sharon M. Swanson AU - Alexander W. Karlsen AU - Brett J. Valentine PY - 2013 DO - 10.3133/ofr20131257 UR - https://pubs.usgs.gov/publication/ofr20131257 ID - ofr20131257 ER -