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Alternatively, interpretation based on the fossil-bearing rocks along the Red Deer River in Alberta, Canada, supports the gradual extinction of non-avian dinosaurs; during the last 10 million years of the Cretaceous layers there, the number of dinosaur species seems to have decreased from about 45 to approximately 12. Other scientists have made ...
The only recorded find of a dinosaur fossil in Central America consists of a single femur discovered from Middle Cretaceous age deposits in Comayagua Department in the central part of Honduras. The fossil had been found in January, 1971 by Bruce Simonson and Gregory Horne, though it was later sent to the National Museum of Natural History, USA ...
A troodontid theropod who is known from fossil teeth. Fossils have also been found in the Lance Formation in Wyoming. Pectinodon [96] [95] P. bakkeri [96] [95] Montana; UCM 38445, a fossilized tooth. Teeth of this genus have been found too. A troodontid theropod who is known from fossil teeth. Fossils have also been found in the Lance Formation ...
A study aiming to quantify the habitat of latest Cretaceous North American dinosaurs, based on data from fossil occurrences and climatic and environmental modelling, and evaluating its implications for inferring whether dinosaur diversity was in decline prior to the Cretaceous–Paleogene extinction event, was published by Chiarenza et al ...
Little known hadrosaur first discovered in North Carolina in 1869. Better material of a second species was found in Missouri. Lophorhothon: Upper Cretaceous: herbivore: Hadrosauromorph from Alabama with skull fragments discovered. In 2021, a more complete skeleton was unearthed. [1] Niobrarasaurus: Upper Cretaceous: herbivore
[7] [16] In 2016, the paleontologist James A. Campbell and colleagues did not support the assignment of specimen CMN 8801 to Kosmoceratops, as they found the features this was based on to be either influenced by taphonomy (changes occurring during decay and fossilization) or to fall within the variation among Chasmosaurus specimens (though they ...
Given the completeness of the specimen, the newly described genus was, at the time, the best-known theropod discovered in America. In 1898 and 1899, the specimen was transferred to the National Museum of Natural History in Washington, DC, along with many other fossils originally described by Marsh. Only part of this material was fully prepared ...
In addition to formally named taxa, indeterminate anuran remains have been recovered from Morrison strata in Colorado, Wyoming, and Utah, with the best specimens found in Dinosaur National Monument and Quarry 9. [15] Stratigraphically speaking, indeterminate anurans have been found in stratigraphic zones 2 and 4. [8]