The Huincul Formation is thought to represent an arid environment with ephemeral or seasonal streams.

It is mainly composed of green and yellow sandstones and can easily be differentiated from the overlying Lisandro Formation, which is red in color.

The titanosaurian sauropod Argentinosaurus huinculensis, one of the largest known land animals, is named after the formation.

[2] Another noteworthy Huincul dinosaur is the carcharodontosaurid theropod Mapusaurus roseae, which is regarded as one of the largest known terrestrial predators.

[7] Apart from the taxa named here, fossils of unnamed squamates and neosuchian crocodyliforms have been discovered in the formation.