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The Castrillo de la Reina Formation is a geological formation in Spain. It is late Barremian to early Aptian in age. It interpreted as a fluvial deposit. It primarily consists of red clay, with ribbon shaped sandstone channel fills. The rebbachisaurid dinosaur Demandasaurus is known from the formation, alongside somphospondylan Europatitan as well as indeterminate small ornithopods, iguanodonts and spinosaurids, the earliest known stem-rhabdodontid and the lizard Arcanosaurus.
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