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

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Title: New discoveries of vertebrate remains from the Triassic of Riba de Santiuste, Guadalajara (Spain)
Authors: Berrocal-Casero, Mélani | Audije-Gil, Julia | Castanhinha, Rui Alexandre | Pérez-Valera, Juan Alberto | Santos, Vanda Faria dos | Segura, Manuel
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Nothosaurs | Placodonts | Rauisuchia | Swim traces | Ladinian | Spain
Knowledge Area: Paleontología
Issue Date: Aug-2018
Publisher: Elsevier
Citation: Proceedings of the Geologists' Association. 2018, 129(4): 526-541. doi:10.1016/j.pgeola.2018.04.009
Abstract: 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.
Sponsor: This work is developed within Predoctoral Research Training Grant CT45/15-CT46/15 from the UCM, and is a contribution to Research Projects CGL2015-66604 and CGL2015-68363 from the Spanish Ministerio de Economía y Competitividad (Economy and Competitiveness Ministry).
URI: http://hdl.handle.net/10045/79227
ISSN: 0016-7878
DOI: 10.1016/j.pgeola.2018.04.009
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 The Geologists' Association. Published by Elsevier Ltd.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.pgeola.2018.04.009
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