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Pages in category "Cretaceous birds of North America" This category contains only the following page. This list may not reflect recent changes. A. Avisaurus
Cretaceous period birds, in the Mesozoic Era. The Cretaceous is a geologic period and system from circa 145 million years ago to 66 million years ( Ma ) ago. See also the succeeding Category:Paleogene birds
A terrestrial dinosaur genus in both continents would then support Brett — Surman's theory that there had been a land connection between the two continents. [ 6 ] Further discoveries and further study by Chiappe showed that all of the material belonged to enantiornithine birds, and PVL 4690 was given its own genus Soroavisaurus .
Pages in category "Late Cretaceous birds of North America" The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes. A.
However, the most reliable early record of North American dinosaurs comes from fragmentary saurischian fossils unearthed from the Upper Triassic Dockum Group of Texas. [2] Later in the Triassic period, dinosaurs left more recognizable remains, and could be identified as specific genera.
The shared history of birds and dinosaurs is well-established, but exactly how true birds evolved during the Mesozoic is a bit of a mystery. Adding to this conundrum are fossilized footprints of ...
Ichthyornithes is an extinct group of toothed avialan dinosaurs very closely related to the common ancestor of all modern birds.They are known from fossil remains found throughout the late Cretaceous period of North America, though only two genera, Ichthyornis and Janavis, are represented by complete enough fossils to have been named.
This list of Mesozoic birds is a comprehensive list of all Mesozoic dinosaurs that have been assigned to the clade Avialae (birds, in the broadest sense). The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomen dubium), or were not formally published (nomen nudum), as well as junior synonyms of more established names, and genera that are ...