Feliz Deserto Formation

The Feliz Deserto Formation is a geologic formation of the Early Cretaceous age (Berriasian to Valanginian) in northeastern Brazil's Sergipe-Alagoas Basin. The formation belongs to the rift phase, in which a great lake formed.

Background
The formation provided fossils of bivalve and gastropod molluscs, vertebrate remains of Lepidotes fish and teeth of crocodylomorphs and spinosaurids, the oldest of the family reported in South America.