The Bajo Barreal Formation is a geological formation in the Golfo San Jorge Basin of Chubut and Santa Cruz, Argentina whose strata date back to the Middle Cenomanian to Late Turonian.

[1] The sandstones, claystones, mudstones, conglomerates and tuff were deposited in a fluvial environment.

[2] The upper part of formation is laterally equivalent to the Yacimiento El Trébol and Meseta Espinosa Formation and the lower part to the Laguna Palacios, Cañadón Seco and Comodoro Rivadavia Formations.

The Bajo Barreal Formation is a reservoir rock in the Golfo San Jorge Basin.

[3] Indeterminate abelisauroids and titanosaurs have been recovered from the formation Other fossils found in the formation include:[16][17][18]