[dinosaur] Late Cretaceous dinosaurs from James Ross Basin, Antarctica (free pdf)

Ben Creisler
[email protected]


This paper was posted earlier as an abstract only. The full paper is now
out in open access:


Free pdf:


Matthew C. Lamanna, Judd A. Case, Eric M. Roberts, Victoria M. Arbour,
Ricardo C. Ely, Steven W. Salisbury, Julia A. Clarke, D. Edward Malinzak,
Abagael R. West & Patrick M. O’Connor (2019)
Late Cretaceous non-avian dinosaurs from the James Ross Basin, Antarctica:
description of new material, updated synthesis, biostratigraphy, and
paleobiogeography.
Advances in Polar Science 30(3): 228-250
doi: 10.13679/j.advps.2019.0007
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.aps-2Dpolar.org_paper_2019_30_03_A190809000001&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=DuU21FMN-KHygCCXlHRWq0-j8fqYQxiDRLSwJS3Kcsg&s=ZOsp1k4xTVrB0OvJqOLsqJOXi7A0skyAtS0le28PV_g&e= 

Free pdf link:
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Although the fossil record of non-avian dinosaurs from the Cretaceous of
Antarctica is the poorest of any continent, fossils representing at least
five major taxonomic groups (Ankylosauria, early-diverging Ornithopoda,
Hadrosauridae, Titanosauria, and Theropoda) have been recovered. All come
from Upper Cretaceous (Coniacian–Maastrichtian) marine and nearshore
deposits belonging to the Gustav and Marambio groups of the James Ross
Basin at the northern tip of the Antarctic Peninsula. The majority of these
finds have come from the Campanian–Maastrichtian Snow Hill Island and López
de Bertodano formations of James Ross and Vega islands. Given the rarity of
Antarctic Cretaceous non-avian dinosaurs, discoveries of any fossils of
these archosaurs, no matter how meager, are of significance. Here we
describe fragmentary new ornithischian (ankylosaur and ornithopod) material
from the upper Campanian–lower Maastrichtian Cape Lamb Member of the Snow
Hill Island Formation and the Maastrichtian Sandwich Bluff Member of the
López de Bertodano Formation. One of these specimens is considered to
probably pertain to the holotypic individual of the early-diverging
ornithopod Morrosaurus antarcticus. We also provide an up-to-date synthesis
of the Late Cretaceous non-avian dinosaur record of the James Ross Basin
and analyze the biostratigraphic occurrences of the various finds,
demonstrating that most (including all named taxa and all reasonably
complete skeletons discovered to date) occur within a relatively condensed
temporal interval of the late Campanian to early Maastrichtian. Most or all
James Ross Basin dinosaurs share close affinities with penecontemporaneous
taxa from Patagonia, indicating that at least some continental vertebrates
could disperse between southern South America and Antarctica during the
final stages of the Mesozoic.


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