The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina

The Allen Formation is the oldest stratigraphic unit of the Malargüe Group that crops out mainly in the North of Patagonia. Although most of the fossil vertebrates recovered from this unit (e.g., Lepisosteiformes, Chelidae, Dipnoii, Theropoda and Sauropoda dinosaurs) are typically continental elemen...

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Autores principales: O'Gorman, José Patricio, Bona, Paula, Salgado, Leonardo
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Río Negro (Argentina)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16931
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16931
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Río Negro (Argentina)
spellingShingle Ciencias Naturales
Paleontología
Río Negro (Argentina)
O'Gorman, José Patricio
Bona, Paula
Salgado, Leonardo
The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
topic_facet Ciencias Naturales
Paleontología
Río Negro (Argentina)
description The Allen Formation is the oldest stratigraphic unit of the Malargüe Group that crops out mainly in the North of Patagonia. Although most of the fossil vertebrates recovered from this unit (e.g., Lepisosteiformes, Chelidae, Dipnoii, Theropoda and Sauropoda dinosaurs) are typically continental elements, plesiosaur remains were also found in several localities. Here we report the first record of a marine turtle, collected from the lower levels of the Allen Formation, in the proximities of Cerro Bonaparte locality, in the Bajo de Santa Rosa area, Río Negro Province. The new material (MML PV 426) consists of a distal fragment of a radius that shows anatomical features shared by Dermochelys coriacea (Linnaeus) (e.g., absence of medular cavity and distal portion with a convex surface, probably for the articulation with the intermedium carpal element, and covered by vascular foramina). The vascular foramina indicate the presence of transphyseal vascular channels that vascularized the chondroepiphyses. In reptiles this feature is also reported in plesiosaurs. Nevertheless the anatomical configuration of the appendicular bone mentioned here did not fit with the pattern present in the propodial elements of plesiosaurs limbs, which are characterized by the presence of two heads in its terminal portion (capitulum, terminally, and tuberosity/trochanter, dorsally). The addition of marine turtles to the vertebrate fauna of the Allen Formation supports the hypothesis of a marine environment influence for this unit.
format Objeto de conferencia
Resumen
author O'Gorman, José Patricio
Bona, Paula
Salgado, Leonardo
author_facet O'Gorman, José Patricio
Bona, Paula
Salgado, Leonardo
author_sort O'Gorman, José Patricio
title The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
title_short The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
title_full The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
title_fullStr The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
title_full_unstemmed The first record of a marine turtle from the Allen Formation (upper Campanian-middle Maastrichtian), Río Negro Province, Patagonia, Argentina
title_sort first record of a marine turtle from the allen formation (upper campanian-middle maastrichtian), río negro province, patagonia, argentina
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16931
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bdutipo_str Repositorios
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