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Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria." [1] In 1887 and 1888 Harry Seeley divided dinosaurs into the two orders Saurischia and Ornithischia, based on their hip structure. [2]
The Patuxent Formation in Maryland, where the holotype of P. marylandicus was discovered in 1997. From 1994 on, Ray Stanford uncovered an ichnofauna in Maryland near the border with Washington D.C. Along with dinosaur footprints, the impressions of a neonate nodosaurid, specimen USNM 540686, were found by Stanford in 1997.
Saurischia (/ s ɔː ˈ r ɪ s k i ə / saw-RIS-kee-ə, meaning "reptile-hipped" from the Greek sauros (σαῦρος) meaning 'lizard' and ischion (ἴσχιον) meaning 'hip joint') [3] is one of the two basic divisions of dinosaurs (the other being Ornithischia), classified by their hip structure.
The following outline is provided as an overview of and topical guide to dinosaurs: . Dinosaurs – diverse group of animals of the clade and superorder Dinosauria.They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period (about in 1963) until the end of the Cretaceous (2000), when the Cretaceous–Paleogene extinction event led to the extinction ...
Type locality for the Morrison Formation above the town of Morrison, Colorado. The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America.
Anchiornis is a genus of small, four-winged paravian dinosaurs, with only one known species, the type species Anchiornis huxleyi, named for its similarity to modern birds.The Latin name Anchiornis derives from a Greek word meaning "near bird", and huxleyi refers to Thomas Henry Huxley, a contemporary of Charles Darwin.
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Borealopelta was a large dinosaur, measuring 5.5 metres (18 ft) long and weighing 1.3 metric tons (1.4 short tons). The Suncor specimen is remarkable for its three-dimensional preservation of a large, articulated dinosaur complete with soft tissue.