The Sulphur Mountain Formation has yielded fossils that provide a record of Triassic life shortly after the Permian-Triassic extinction event. Remains of extinct marine reptiles and fish have been found in its strata, as well as conodonts; shells of brachiopods and bivalves; teeth of Hybodus; shells of ammonoids; the ichnofossils Thalassinoides, Planolites, and Zoophycos; and traces of microbial mats.