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New discoveries of vertebrate remains from the Triassic of Riba de Santiuste, Guadalajara (Spain)



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Berrocal-Casero, Mélani and Audije-Gil, Julia and Alexandre Castanhinha, Rui and Pérez Valera, Juan Alberto and Faria dos Santos, Vanda and Segura, Manuel (2018) New discoveries of vertebrate remains from the Triassic of Riba de Santiuste, Guadalajara (Spain). Proceedings of the Geologists' Association, 129 (4). pp. 526-541. ISSN 0016-7878

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Official URL: https://www.sciencedirect.com/science/article/pii/S0016787818300658


The palaeontological sites of Riba de Santiuste and Sienes (Riba de Santiuste area) are located in the province of Guadalajara, Spain. They include a stratigraphic interval in Muschelkalk facies belonging to the “Cuesta del Castillo Sandstones” Formation and “Royuela Dolostones, Marls and Mudstones” Formation. These sites include numerous fossil plants, direct vertebrate remains, and vertebrate swim traces. The vertebrate remains correspond to a multitude of anatomical elements of Sauropterygia (Nothosauroidea, Placodontia) and possible Archosauria (Rauisuchia) remains. The fossil material attributed to nothosaurs includes teeth, coracoids, a thoracic vertebra, some isolated vertebral centra, humerus, rib fragments, and some dorsal and caudal vertebrae. The remains attributed to placodonts correspond to fragments of skull, quadrate, teeth and osteoderms. Other undetermined sauropterygian remains, such as ulnas, fragments of long bones, fragments of ribs, and articular facets of ribs have been also recovered. Additionally, a fragment of mandible and an intervertebral disk of indeterminate reptiles whose size could be compatible with archosaurs are also described. These bones are exceptionally well-preserved because the fossilization processes have preserved the microstructure of the tissues. The sites also show vertebrate traces, with parallel scratch impressions interpreted as swim traces. The relative stratigraphic position and the palaeontological content of these sites suggest a Ladinian age (Middle Triassic). The interpretation of the sedimentary facies here described also suggests that the sites could correspond to detrital-carbonate mixed deposits of coastal intertidal to supratidal environments.

Item Type:Article
Uncontrolled Keywords:Nothosaurs, Placodonts, Rauisuchia, Swim traces, Ladinian, Spain
Subjects:Sciences > Geology > Paleontology
ID Code:50805
Deposited On:18 Jan 2019 18:04
Last Modified:21 Jan 2019 09:19

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