[dinosaur] Isasicursor, new iguanodontian, Nullotitan, new titanosaur, Kookne, new bird, from Upper Cretaceous Chorrillo Formation of Argentina (free pdf)

Ben Creisler
[email protected]


A new paper with free pdf:

Isasicursor santacrucensis gen. et sp. nov. (Euiguanodontia)

Nullotitan glaciaris gen. et sp. nov. (Titanosauria)

Kookne yeutensis gen. et sp. nov.  (Aves)


Fernando Novas, Federico Agnolin, Sebastián Rozadilla, Alexis
Aranciaga-Rolando, Federico Brissón-Eli, Matias Motta, Mauricio Cerroni,
Martín Ezcurra, Agustin Martinelli, Julia D'Angelo, Gerardo
Álvarez-Herrera, Adriel Gentil, Sergio Bogan, Nicolas Chimento, Jordi
García-Marsà, Gastón Lo Coco, Sergio Miquel, Fatima Brito, Ezequiel Vera,
Valeria Loinaze, Mariela Fernandez, Leonardo Salgado (2019)
Paleontological discoveries in the Chorrillo Formation (upper
Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province,
Patagonia, Argentina.
Revista del Museo Argentino de Ciencias Naturales n.s. 21(2): 217-293
https://urldefense.proofpoint.com/v2/url?u=http-3A__revista.macn.gob.ar_ojs_index.php_RevMus_article_view_655&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=XJSNKDEc4lDafvgtKMn_fz3mRqTp88zWpDtXveopUkI&s=OTAACF1s8iXsMxDfz5XuEgyY1Is91h5QvHce3PZprso&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__revista.macn.gob.ar_ojs_index.php_RevMus_article_view_655_537&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=XJSNKDEc4lDafvgtKMn_fz3mRqTp88zWpDtXveopUkI&s=jFTgd-YQPjYiGSyoW68Fes5VN7etKGgDpShPtzFtyr8&e= 


The first fossil remains of vertebrates, invertebrates, plants and
palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the
SW of the town of El Calafate (Province of Santa Cruz), are described.
Fossils include the elasmarian (basal Iguanodontia) Isasicursor
santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris
gen. et sp. nov., both large and small Megaraptoridae indet., and fragments
of sauropod and theropod eggshells. The list of vertebrates is also
composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated
caudal vertebrae of Mammalia indet., and isolated teeth of a large
mosasaur. Remains of fishes, anurans, turtles, and snakes are represented
by fragmentary material of low taxonomical value, with the exception of
remains belonging to Calyptocephalellidae. On the other hand, a remarkable
diversity of terrestrial and freshwater gastropods has been documented, as
well as fossil woods and palinological assemblages. The Chorrillo Formation
continues south, in the Las Chinas River valley, southern Chile, where it
is called Dorotea Formation. Both units share in their lower two thirds
abundant materials of titanosaurs, whose remains cease to appear in the
upper third, registering only elasmarians (Chorrillo Formation) and
hadrosaurs (Dorotea Formation). Above both units there are levels with
remains of invertebrates and marine reptiles. It is striking that the
dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations
are represented by large basal titanosaurs and Megaraptoridae coelurosaurs,
being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae
theropods totally absent. In contrast, these taxa are dominant components
in sedimentary units of central and northern Patagonia (e.g., Allen, Los
Alamitos, La Colonia formations). Such differences could reflect, in part,
a greater antiquity (i.e., late Campanian-early Maastrichtian) for the
Chorrillo fossils, or, more probably, different environmental conditions.
Thus, knowledge of the biota of the southern tip of Patagonia is expanded,
particularly those temporarily close to the K-Pg boundary.