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- Vertebrate paleontology - Wikipedia
Ancestral birds like Archaeopteryx [1] first evolved from dinosaurs during the Jurassic, with crown-group birds emerging in the Cretaceous between 100 Ma and 60 Ma [ 2 ] The K-Pg mass extinction wiped out many vertebrate clades, including the pterosaurs , plesiosaurs , mosasaurs and nearly all dinosaurs , leaving many ecological niches open
- Constraints on the timescale of animal evolutionary history
Although the earliest unambiguous metazoan fossils date to the late Ediacaran period, molecular clock estimates agree that the last common ancestor (LCA) of all extant animals emerged ~850 Ma, in
- Apatosaurus - Wikipedia
Apatosaurus ( ə ˌ p æ t ə ˈ s ɔːr ə s ; [3] [4] meaning "deceptive lizard") is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period Othniel Charles Marsh described and named the first-known species, A ajax, in 1877, and a second species, A louisae, was discovered and named by William
- List of dinosaurs and other Mesozoic reptiles of New Zealand
Newer fossils from a Cretaceous-Paleogene boundary fossil formation known as the Takatika Grit in the Chatham Islands include six or seven (possibly more) bones from dinosaurs, as well as numerous bones from early birds, but more information is needed about these to add them to the list
- Facts About Cryolophosaurus and Its Discovery - ThoughtCo
It was only during the late Cretaceous period that some meat-eating dinosaurs (like Tyrannosaurus Rex and Troodon) took eensy-weensy evolutionary steps toward a higher-than-average level of intelligence Like most of the plus-sized theropods of the Jurassic and late Triassic periods — not to mention the even dumber plant eaters
- Arboretum contains more than 200 varieties
By the mid-Jurassic Period, conifers had become more diverse and many of their fossils have been assigned to modern families such as Araucariaceae, Pinaceae and Taxodiaceae Angiosperm pollen and leaves first appeared in the fossil record about 140 million years ago in the early Cretaceous Period
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