The Castrillo de la Reina Formation is a geological formation in

Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...

. It is late

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 125.77 Ma (million years ago) and 121.4 ± 1.0 Ma (Historically, this stage was placed at 129.4 million to approximately 125 million years ago) It is a ...

to early

Aptian The Aptian is an age (geology), age in the geologic timescale or a stage (stratigraphy), stage in the stratigraphic column. It is a subdivision of the Early Cretaceous, Early or Lower Cretaceous epoch (geology), Epoch or series (stratigraphy), S ...

in age. It interpreted as a fluvial deposit. It primarily consists of red clay, with ribbon shaped sandstone channel fills. The

rebbachisaurid Rebbachisauridae is a Family (biology), family of sauropod dinosaurs known from fragmentary fossil remains from the Cretaceous of South America, Africa, North America, Europe and possibly Central Asia. Taxonomy In 1990 sauropod specialist Jack M ...

dinosaur ''

Demandasaurus ''Demandasaurus'' (meaning "Sierra de la Demanda, Demanda lizard") is a genus of Rebbachisauridae, rebbachisaurid sauropod dinosaur from early Cretaceous (late Barremian — early Aptian stage) deposits of Spain. ''Demandasaurus'' is known from a ...

'' occurs in the formation, alongside

somphospondylan Somphospondyli is an extinct clade of titanosauriform sauropods that lived from the Late Jurassic until the end of the Late Cretaceous, comprising all titanosauriforms more closely related to Titanosauria proper than Brachiosauridae. The remain ...

Europatitan ''Europatitan'' is an extinct genus of Somphospondyli, somphospondylan sauropod from the Early Cretaceous Castrillo de la Reina Formation of Iberia, known from a relatively complete specimen discovered in the early 2000s. It contains a single spe ...

'' as well as indeterminate small

ornithopod Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively sm ...

iguanodonts Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively sm ...

(including members of the Hadrosauriformes) and

spinosaurid Spinosauridae (or spinosaurids) is a clade or Family (taxonomy), family of tetanuran theropod dinosaurs comprising ten to seventeen known genera. Spinosaurid fossils have been recovered worldwide, including Africa, Europe, South America, and Asia. ...

s, an early rhabdodontoid (indeterminate) and the lizard '' Arcanosaurus''.

Fossil content

Correlation

References

{{reflist Geologic formations of Spain Lower Cretaceous Series of Europe Cretaceous Spain Aptian Stage Barremian Stage Shale formations Sandstone formations Alluvial deposits Fluvial deposits Paleontology in Spain