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A new wide-guage sauropod track site from the Late Cretaceous .....
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- Subject: A new wide-guage sauropod track site from the Late Cretaceous .....
- From: "Yasmani Ceballos Izquierdo" <email@example.com>
- Date: Mon, 18 May 2009 17:32:10 -0400
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J.G.R. Riga & J.O. Calvo, 2009. A new wide-guage sauropod track site from the
Late Cretaceous of Mendoza, Neuquen Basin, Argentina. Palaeontology
52(3):631-640. ABSTRACT. Agua del Choique is a new Late Cretaceous sauropod
track site from Mendoza Province, Neuquén Basin, Argentina. It is situated in
the Loncoche Formation, late Campanian - early Maastrichthian in age, and is
one of the youngest sauropod tracks site recorded in the world. Agua del
Choique represents a lake setting and river-dominated delta deposits, and
comprises at least 160 well-preserved tracks, located on a calcareous sandstone
bed. A new ichnotaxon, Titanopodus mendozensis ichnogen. et ichnosp. nov., is
erected for the footprints of this track site. Titanopodus mendozensis
exhibits the following association of features: (1) wide-gauge trackway (manus
and pes trackway ratios of 18-22 and 26-31 per cent respectively), (2)
pronounced heteropody (manus-pes area ratio of 1:3), (3) outer limits of
trackway defined, in some cases, by the manus tracks, and (4) manus impression
with an asymmetrical crescent contour and acuminate external border.
Titanopodus mendozensis is an excellent case study of the wide-gauge style of
locomotion produced by Late Cretaceous derived titanosaurs that have no
impression of manual phalanges. These features, and the fossil record from the
Loncoche Formation, suggest that the trackmakers were, probably, middle size
saltasaurine or aeolosaurine20titanosaurs (14-16 m long).