Search results
Results From The WOW.Com Content Network
The temperature increased about three to four degrees very rapidly between 65.4 and 65.2 million years ago, which is very near the time of the extinction event. Not only did the climate temperature increase, but the water temperature decreased, causing a drastic decrease in marine diversity. [266]
Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5] Evidence suggests that it was semiaquatic; how capable it was of swimming has been strongly contested. Spinosaurus's leg bones had osteosclerosis (high bone density), allowing for better buoyancy control.
The genus Spinosaurus, from which the family, one of its subfamilies (Spinosaurinae) and tribes (Spinosaurini) borrow their names, is the longest known terrestrial predator from the fossil record, with an estimated length of up to 14 meters (46 ft) and body mass of up to 7.4 metric tons (8.2 short tons) (similar to the weight of an African ...
Definite evidence of Late Cretaceous sauropods in North America was first discovered in 1922, when Charles Whitney Gilmore described Alamosaurus sanjuanensis. [1] The term "sauropod hiatus" was coined by researchers Spencer G. Lucas and Adrian P. Hunt in 1989 to describes how fossils of the clade become scarce in western North America near the beginning of the Late Cretaceous.
Extinct in the 1990s due to habitat destruction and fragmentation. [8] Flat pigtoe: Pleurobema marshalli: Tombigbee River, Mississippi and Alabama Extinct in 1984 due to loss of all habitat through impoundment or channelization. [8] Rio Grande monkeyface: Rotundaria couchiana: Rio Grande Extinct in the early 1900s due to habitat degradation. [8 ...
The largest carnivorous dinosaur was Spinosaurus, reaching a length of 12.6 to 18 meters (41 to 59 ft) and weighing 7 to 20.9 metric tons (7.7 to 23.0 short tons). [154] [155] Other large carnivorous theropods included Giganotosaurus, Carcharodontosaurus, and Tyrannosaurus. [155] Therizinosaurus and Deinocheirus were among the tallest of the ...
Artist's depiction of the end-Cretaceous impact eventSince the 19th century, a significant amount of research has been conducted on the Cretaceous–Paleogene extinction event, the mass extinction that ended the dinosaur-dominated Mesozoic Era and set the stage for the Age of Mammals, or Cenozoic Era.
Night snake [134] [135] Hypsiglena torquata: Multiple mid and posterior trunk vertebrae as well as anterior trunk vertebrae, precloacal vertebrae and juvenile remains Assignment to H. torquata was primarily based on geography. Although falling in the range of variation of the modern form, the fossil did show relatively shorter vertebrae.