The Ripley Formation is a geological formation in North America found in the U.S. states of Alabama, Georgia, Mississippi, Missouri,[1] and Tennessee.

It was formed by sediments deposited during the Maastrichtian stage of the Late Cretaceous.

It is a unit of the Selma Group and consists of the Cusseta Sand Member, McNairy Sand Member and an unnamed lower member.

[2] It has not been extensively studied by vertebrate paleontologists, due to a lack of accessible exposures.

However, fossils have been unearthed including crocodile, hadrosaur, nodosaur, tyrannosaur, ornithomimid, dromaeosaur, and mosasaur remains have been recovered from the Ripley Formation.