Rocks in the Neuquén Group fall within the Cenomanian to early Campanian stages of the Late Cretaceous Period.

[1] Deposits have been located in the provinces of Río Negro, Neuquén, and Mendoza.

Although several different types of environments are represented in various sections of the Neuquén Group, the dominant regime is alluvial deposition.

However, particularly in the Río Limay Subgroup, the formations are clearly composed of very distinct rock layers.

[2] Neuquén Group strata, ordered from youngest to oldest South of Añelo, on the road between Lake Los Barreales and the Neuquén River are views on the successively younger formations, starting with the Lisandro Formation to the northwest of Lake Los Barreales, and finally crossing the Anacleto Formation about 35 kilometres (22 mi) down the road near the eastern tip of the lake.