The Santa Rosa fossil site, where LACM 149371 was found, is in the Ucayali Region of Peru. The Santa Rosa fauna also contains fossils of various unique species of marsupials and hystricognath rodents, a possible bat, and some notoungulates (a unique extinct group of South American ungulates). The age of this fauna is unclear, and estimates range from near the Eocene–Oligocene boundary (~35 mya) to the late Oligocene (~25 mya). The Santa Rosa mammals may have lived in a savanna habitat that contained rivers.