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Dimetrodon (/ d aɪ ˈ m iː t r ə ˌ d ɒ n / ⓘ [1] or / d aɪ ˈ m ɛ t r ə ˌ d ɒ n /; [2] lit. ' two measures of teeth ') is an extinct genus of non-mammalian synapsid belonging to the family Sphenacodontidae that lived during the Cisuralian age of the Early Permian period, around 295–272 million years ago.
A neural spine sail is a large, flattish protrusion from the back of an animal formed of a sequence of extended vertebral spinous processes and associated tissues. Such structures are comparatively rare in modern animals, but have been identified in many extinct species of amphibians and amniotes .
Non-Avian Dinosaur tracks, [2] plants, insects Dinosaur Provincial Park [Note 2] Dinosaur Park Formation: Cretaceous (Campanian) North America: Canada: Alberta: Non- Avian Dinosaurs: Dinosaur State Park: Jurassic: North America: US: Connecticut: Dinosaur tracks: Driftwood Canyon Provincial Park: Eocene: North America: Canada: British Columbia ...
Gerry Hughes; 2012–2013; first deaf yachtsman to sail single-handed around the world to pass the five great capes. On 1 September 2012, Hughes left Troon, Scotland to start his eight-month journey across the world. Hughes travel around the world solo, sailed 32,000 miles and became the first deaf yachtsman to passed all five southernmost capes.
Another common group of North American dinosaurs were the hadrosaurs, the so-called "duck-billed" dinosaurs. The fossil record shows a staggering variety of hadrosaur forms in Laramidia. Other differences in genera appear between the island land masses. Sauropods roamed Laramidia during the Cretaceous after apparently dying out in Appalachia.
Researchers have uncovered hundreds of dinosaur footprints dating back to the middle Jurassic era in a quarry in Oxfordshire, southern England, showing that reptiles such as the nine-metre ...
By the time Pangaea broke up, in the Middle Jurassic, the seas swarmed with molluscs (particularly ammonites), [41] ichthyosaurs, sharks and rays, and the first ray-finned bony fishes, while life on land was dominated by forests of cycads and conifers in which dinosaurs flourished and in which the first true mammals had appeared. [42] [43]
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