Locality: Along the Acre River and the tributaries between the municipalities of Brasileia and Assis Brasil, Acre State, Brazil.
Horizon: Solimoes Formation.
Age: Lower Eocene Stage, Paleogene Period, Lower Tertiary Subera, Lower Cenozoic Era.
DGM 964-R, DGM 965-R, DGM 1080-R, DGM 1129-R, DGM 1167-R, DGM 1206-R, DGM 1209-R, DGM 1225-R: Teeth.
DGM 1291-R: Mandible.