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Freixial Formation

The Freixial Formation is a Late Jurassic geologic formation with outcrops in central Portugal. The formation has produced the fossils of many vertebrates, including non-avian dinosaurs. It was deposited during the Tithonian age of the Late Jurassic.

Stratigraphy and paleoenviroment

Outcrops of the Freixial Formation are located in the Lusitanian Basin of Central Portugal. It is considered to represent the youngest Jurassic rocks in the region, and it overlies the more well-known Lourinhã Formation. The depositional environment is interpreted as comprising deltaic and distal fluvial environments. The formation was deposited during the Tithonian age, spanning around . The thickest outcrops are tall. It had once been considered synonymous with the Assenta Member of the Lourinha Formation, but more papers treat the Freixial Formation as a distinct unit. In the south of the basin, it interfingers with rocks of the Lourinha Formation.

Vertebrate paleofauna

Dinosaurs

Ornithischians

Theropods

Various theropod teeth from the Freixial Formation have been referred to the genera Allosaurus, Torvosaurus, and Ceratosaurus on the basis of cladistic and multivariate analysis.' According to Mateus et al. 2024, a combination of both methods is strong enough to confidently assign teeth on the genus level.

Sauropods

Mammalia

References