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Fwd: Oldest Cretaceous North American sauropod dinosaur



Apparently this post did not go through to the DML. I'll try again.


---------- Forwarded message ----------
From: Ben Creisler <bcreisler@gmail.com>
Date: Mon, Nov 17, 2014 at 8:27 AM
Subject: Oldest Cretaceous North American sauropod dinosaur
To: dinosaur@usc.edu


Ben Creisler
bcreisler@gmail.com


A new online paper:

M.D. D'Emic & J.R. Foster (2014)
The oldest Cretaceous North American sauropod dinosaur.
Historical Biology (advance online publication)
DOI:10.1080/08912963.2014.976817
http://www.tandfonline.com/doi/full/10.1080/08912963.2014.976817#.VGofevnF_To

Sauropod dinosaurs have been found in sediments dating to most of the
Cretaceous Period on all major Mesozoic landmasses, but this record is
spatiotemporally uneven, even in relatively well-explored North
American sediments. Within the 80 million-year-span of the Cretaceous,
no definitive sauropod occurrences are known in North America from two
ca. 20–25 million-year-long gaps, one from approximately the
Berriasian–Barremian and the other from the mid-Cenomanian–late
Campanian. Herein, we present an undescribed specimen that was
collected in the middle part of the twentieth century that expands the
known spatiotemporal distribution of Early Cretaceous North American
sauropods, partially filling the earlier gap. The material is from the
Berriasian–Valanginian-aged (ca. 139 Ma) Chilson Member of the Lakota
Formation of South Dakota and appears to represent the only
non-titanosauriform from the Cretaceous of North America or Asia. It
closely resembles Camarasaurus and may represent a form closely
related to that genus that persisted across the Jurassic–Cretaceous
boundary.