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Ichthyornis from Upper Cretaceous of Mexico
A new paper:
Hector G. Porras-Múzquiz, Sankar Chatterjee & Thomas M. Lehman (2014)
The carinate bird Ichthyornis from the Upper Cretaceous of Mexico.
Cretaceous Research 51: 148–152
A well-preserved right humerus collected from the upper Austin Group
at Ejido Piedritas in Coahuila, Mexico is referable to the carinate
bird Ichthyornis. This occurrence extends the known distribution of
Ichthyornis to the southwest, and is among a younger
(Coniacian-Campanian) group of specimens, recovered generally to the
south of older (Cenomanian-Turonian) Ichthyornis specimens. The
southward shift in occurrence of Ichthyornis may accord with the
withdrawal of subtropical marine biota from the Western Interior
Seaway of North America during the Late Cretaceous.