The Marree Subgroup, previously described as Maree Formation and Marree Formation, is a geological subgroup in the Eromanga Basin of South Australia whose strata date back to the Aptian.

[2][3] Dinosaur remains are among the fossils that have been recovered from the formation.

[1] An opalised plesiosaur specimen of the genus Umoonasaurus has been nicknamed 'Eric' and was described in 1998 by Schroeder.

[5] Indeterminate theropod remains present in Western Australia.

"[6] Sauropterygians Umoonasaurus[7] U. demoscyllus[7] Bulldog Shale of northern South Australia.