Both formations cover a vast area in Chubut Province, Argentina.

The two formations are distinguished by geological features suggesting a distinct change in climate, from a wetter, flood plain environment in the Los Adobes to a much more arid, desert-like environment in the Cerro Barcino.

[1] The Cerro Barcino Formation is subdivided into several subunits (members).

[1] From oldest to youngest: The Puesto La Paloma Member dates from ~118-113 Ma, the Cerro Castaño Member dates from ~113-100.5 Ma, correlating with the Albian, and the Las Plumas Member dates from ~100.5-98 Ma.

[2] Indeterminate abelisaurid remains from the Puesto La Paloma Member.