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  Encyclopedia of Keywords > Places > Earth > Geology > Cretaceous   Michael Charnine

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  1. The Cretaceous is a geologic period that extends from about 65 to 135 million years before the present (see also geologic timescale).
  2. The Cretaceous is usually separated into lower and upper subdivisions.
  3. Cretaceous is a name derived from the Latin word for chalk, creta. (Web site)
  4. Cretaceous is the name given to a period of time in Earth's history (i.e., Cretaceous Period) from 145.6 to 65 million years ago. (Web site)
  5. The Cretaceous is usually separated into Early and Late Cretaceous epochs. (Web site)


  1. Cretoxyrhina mantelli, the "Jaws of the Cretaceous", was a shark that lived in the Cretaceous period, about 100 million years ago. (Web site)
  2. Modern sharks began to appear about 100 million years ago.[ 54] Fossil mackerel shark teeth date to the Lower Cretaceous. (Web site)


  1. Plesiosaurs (sensu Plesiosauroidea) appeared at the start of the Jurassic Period and thrived until the K-T extinction, at the end of the Cretaceous Period.
  2. At the end of the Cretaceous, the ammonites and many species of foraminifera became extinct. (Web site)
  3. Another early fossil, Dilong paradoxus (early Cretaceous), an ancestor of Tyrannosaurus rex, also had similar feather structures.


  1. Belemnites are common in rocks formed during the Jurassic and Cretaceous periods, vanishing in the mass extinction 65 million years ago. (Web site)
  2. At the end of the Cretaceous Period, 65 million years ago, a catastrophic extinction event ended the dominance of dinosaurs on land. (Web site)
  3. Late Cretaceous to Oligocene sandstone, mudstone and minor limestone were deposited in a passive margin setting.


  1. In the area that is now India, massive lava beds called the Deccan Traps were laid down in the very late Cretaceous and early Paleocene. (Web site)
  2. They existed from the late Triassic to the end of the Cretaceous Period (228 to 65 million years ago).
  3. Protoceratops lived in the late Cretaceous period, about 86 to 71 million years ago, toward the end of the Mesozoic, the Age of Reptiles. (Web site)


  1. Appalachiosaurus Appalachiosaurus Appalachiosaurus is a genus of tyrannosauroid theropod dinosaur from the Late Cretaceous Period of eastern North America. (Web site)
  2. This bipedal meat-eater was perhaps 6.5 ft (2 m) long.z It lived during the late Cretaceous period. (Web site)
  3. It was a long-necked, long-tailed, quadrupedal, plant-eater from the Sahara desert in Egypt during the mid Cretaceous period. (Web site)


  1. Prenoceratops Prenoceratops Prenoceratops, is a genus of ceratopsian dinosaur from the Late Cretaceous Period. (Web site)
  2. During the Jurassic and Cretaceous, the remaining non-mammalian cynodonts were small, such as Tritylodon. (Web site)


  1. Velociraptor is an extinct genus of dinosaur which existed during the Late Cretaceous Period, 83-70 million years ago. (Web site)
  2. This ornithopod was ancestral to many of the highly successful plant-eating dinosaurs of the Cretaceous, such as the duckbills and Iguanodon. (Web site)
  3. Remarks: The only known Upper Cretaceous Mongolian multi not to belong to Djadochtatherioidea.


  1. The one species named by Kielan-Jaworowska and Nessov is Uzbekbaatar kizylkumensis, found in the Upper Cretaceous strata of Uzbekistan.
  2. Bird fossils are rare because bird bones are hollow and fragile, but Jurassic, Cretaceous, Eocene and Miocene-Pliocene bird fossils have been found. (Web site)
  3. In the geologic timescale, the Cretaceous follows on the Jurassic Period and is followed by the Paleogene Period of the Cenozoic Era. (Web site)
  4. The rearward angle of the bone in Archaeopteryx appears in the Jurassic and amongrather bird-like advanced theropods of the Late Cretaceous.

Late Jurassic

  1. A new symmetrodont mammal has been discovered in the Mesozoic era (Late Jurassic or Early Cretaceous period) of Liaoning Province, China. (Web site)
  2. In the Cretaceous, Laurasia split into the continents of North America and Eurasia. (Web site)
  3. Most of these specimens were unearthed in Liaoning province, northeastern China, which was part of an island continent during the Cretaceous period.


  1. Paracimexomys priscus also known as Cimexomys priscus - Fossil remains were found in the Maastrichtian (Upper Cretaceous) of Hell Creek, Montana.
  2. Catopsbaatar is an extinct genus of mammal that lived in Mongolia during the Upper Cretaceous Period.

Upper Jurassic

  1. Bolodon is a genus of extinct mammal from the Lower Cretaceous of Europe, and possibly the Upper Jurassic of North America.
  2. Janumys is a genus of extinct mammal of the middle Cretaceous.

Fossil Record

  1. Gondwanatherium is an extinct mammal genus from the Upper Cretaceous of Patagonia. (Web site)
  2. The osteoderms were collected from rocks that had been correlated to the Cerro del Pueblo Formation (Late Cretaceous: Campanian) of the Difunta Group. (Web site)
  3. Amber deposits only appear in the fossil record in abundance following the proliferation of modern flowering plants during the Cretaceous period. (Web site)


  1. All upper Cretaceous Mongolian multituberculates are included with one exception, the genus Buginbaatar. (Web site)
  2. The quotation comes from the abstract of Hurum (1998), [1] The braincase of two Late Cretaceous Asian multituberculates studied by serial sections. (Web site)


  1. By the Early Cretaceous and the ongoing breakup of Pangaea, dinosaurs were becoming strongly differentiated by landmass. (Web site)
  2. Rare fossils have recently also turned up in the Late Cretaceous of Madagascar and India, all former parts of disintegrating Gondwana.


  1. Didelphodon is a genus of stagodont marsupials from the Late Cretaceous of North America.
  2. In the history of the first modern mammals (i.e., marsupials and placentals), during the Cretaceous, Europe is almost a Terra incognita. (Web site)


  1. Vegavis is a recently discovered genus of extinct birds that lived during the Late Cretaceous period in Antarctica, some 66-68 mya. (Web site)
  2. Modern birds are classified in Neornithes, which are now known to have evolved into some basic lineages by the end of the Cretaceous (see Vegavis). (Web site)
  3. Pterosaurs, which also coexisted with early crown birds, show notable changes through the Late Cretaceous. (Web site)

Type Species

  1. Near the end of the Cretaceous Period, flowering plants diversified and didelphid marsupials and primitive placental mammals also became common.
  2. The discovery of the type species, Vegavis iaai, demonstrates that the major groups of bird alive today had already diversified in the Cretaceous.
  3. Among the terrestrial flora, the gymnosperms of the Permian remained dominant until the evolution of the angiosperms (flowering plants) in the Cretaceous.


  1. Fossil remains of the single species Hahnodon taqueti consist of a single lower molar found in Lower Cretaceous strata in Morocco.
  2. Typical Jurassic vegetation, including conifers, cycads, and other gymnosperms, continued on into the Early Cretaceous without significant changes. (Web site)


  1. The Cimolodonta are a taxon of extinct mammals that lived from the Cretaceous to the Eocene.
  2. Gondwanatheria is an extinct suborder of mammal that lived during the Upper Cretaceous through the Eocene in the Southern Hemisphere, including Antarctica.


  1. The Paracimexomys group is a loose grade of extinct mammals which are known from the Lower Cretaceous and possibly through to the Paleocene of North America.
  2. With critical observations upon the affinities of the Cretaceous mammals." Bulletin of the American Museum of Natural History 35: 477-500.


  1. The fossils represent possibly four new species of seabirds dating back to the late Cretaceous period, around 65 million years ago. (Web site)
  2. The species Bolodon crassidens is known from fossils of the Lower Cretaceous of England, in Durlston Bay, Dorset.


  1. The species Lavanify miolaka was discovered in Madagascar in deposits dated to the Maastrichtian stage of the Upper Cretaceous period. (Web site)
  2. Castorocauda is a new taxon of docodonts, an extinct mammal group that existed from the Middle Jurassic to Late Cretaceous. (Web site)


  1. Bryceomys is an extinct mammal that lived during the late Cretaceous period (between 100 and 65 million years ago) and thus shared the world with dinosaurs.
  2. This includes the more derived Multituberculata, which have been identified from the lower Cretaceous to the Eocene. (Web site)


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Late Cretaceous
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  Originally created: May 09, 2010.
  Links checked: May 29, 2013.
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