Romualdo Formation

The Crato Formation was previously considered the lowest member of the then Santana Formation, but has been elevated to a formal formation. The Crato Formation is the product of a single phase, where complicated sequence of sediment strata reflect changeable conditions in the opening sea. The age of the Romualdo Formation, formerly known as the Romualdo Member of the Santana Formation, has been controversial, though most workers have agreed that it lies on or near the Aptian-Albian boundary, about 112 million years ago. Nevertheless, a Cenomanian age cannot be ruled out. The extent of the Crato unit and its relationship to the Romualdo Formation had long been ill-defined. It was not until a 2007 volume on the unit by Martill, Bechly and Loveridge that the Crato Formation was given a formal type locality, and was formally made a distinct formation separate from the Romualdo Formation, which is about 10 Ma younger. == Fossil content ==

Archosaurs Indeterminate remains of non-avian theropods, avialans, ornithischians, and possibly oviraptorosaurs have been found in Ceara state, Brazil. Dinosaurs Crocodylomorphs Pterosaurs Turtles Fish • Araripelepidotes • Axelrodichthys araripensis. • Beurlenichthys ouricuriensis • Brannerion • Cladocyclus • Enneles audax • Iemanja palma • Lepidotes wenzai • Rhacolepis • Santanaclupea silvasantosi • Tharrhias == See also ==