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New vertebrate tracks from the Neogene Río Negro Formation (Río Negro Province, Argentina)

Abstract: New tetrapod footprints were recently found close to Pozo Salado, on the Atlantic shoreline west of Punta Mejillón area (Río Negro Province, Argentina). Footprints are preserved on the top-surface of a fine-grained sandstone included in a stratigraphic section belonging to the Neogene Río Negro Formation. The tracksite displays abundant footprints but a relatively low ichno-diversity. Both footprint morphologies and extra-morphologies suggest that the surface and subsurface remained compliant to producers of different size-classes during a relatively long time of exposure and trampling. Footprints sufficiently detailed to allow an ichnotaxonomic allocation were classified as Gruipeda maxima, Gruipeda cf. maxima, cf. Porcellusignum isp., and indeterminate Eutardigrada tracks, related to gruiform/ciconiiform birds, hydrochoerid rodents and ground sloths, respectively. The new finding, more than 100 km SW of the typical track-bearing localities of the Atlantic coast, enriches the vertebrate track record from the Río Negro Formation and adds a newly reported ichnospecies.

 Fuente: Ameghiniana, 2022, 59(6), 407 - 417

 Publisher: Asociacion Paleontologica Argentina

 Publication date: 01/12/2022

 No. of pages: 11

 Publication type: Article

 DOI: 10.5710/AMGH.05.11.2022.3496

 ISSN: 1851-8044,0002-7014

 Publication Url: https://doi.org/10.5710/AMGH.05.11.2022.3496

Authorship

CARATELLI, MARTINA

CÓNSOLE-GONELLA, CARLOS

VALAIS, SILVINA DE

MONTES, ROMINA M.

ARCHUBY, FERNANDO M.