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Encyclopedia > Early Cretaceous
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The Early Cretaceous (timestratigraphic name) or the Lower Cretaceous (logstratigraphic name), is the earlier of the two major divisions of the Cretaceous period. The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ...


During this time many new types of dinosaurs appeared or came into prominence, including the Psittacosaurs, Spinosaurs and Coelurosaurs, while other holdovers from the Late Jurassic continued. Jump to: navigation, search Orders Saurischia    Sauropodomorpha    Theropoda Ornithischia Dinosaurs are animals that dominated the terrestrial ecosystem for over 100 million years. ... A parrot dinosaur who lived in Asia in the Late Cretaceous. ... Coelurosauria is a group of theropod dinosaurs that includes the subgroups Tyrannosauridae, Ornithomimidae, and Maniraptora. ... Upper Jurassic (also known as Malm) was an epoch of the Jurassic geologic period. ...


In the seas, the ichthyosaurs declined and eventually died out at the start of the Late Cretaceous. Neognathous birds and angiosperms, appear for the first time. Groups Cymbospondylus Mixosauridae Merriamosauria Shastasauridae/Shastasauria Euichthyosauria Parvipelvia Leptonectidae Thunnosauria Stenopterygidae Ichthyosauridae Ichthyosaurs (Greek for fish lizards) were giant marine reptiles that resemble a dolphin with teeth (see convergent evolution). ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... For other meanings of bird, see bird (disambiguation). ... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ...

Cretaceous period
Lower/Early Cretaceous Upper/Late Cretaceous
Berriasian Valanginian Hauterivian Cenomanian Turonian Coniacian
Barremian Aptian Albian Santonian Campanian Maastrichtian
Mesozoic era
Triassic Jurassic Cretaceous

The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... Jump to: navigation, search In the geologic timescale, Berriasian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon. ... In the geologic timescale, Valanginian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon. ... Jump to: navigation, search The Barremian faunal stage was a period of geological time between 117 and 113 million years ago. ... Jump to: navigation, search In the geologic timescale, the Aptian is the age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon that is comprehended between 125 and 112 million years ago, approximately. ... Jump to: navigation, search Albian (Fr. ... Jump to: navigation, search The Campanian is a stage on the geologic time scale occuring from 83. ... The Maastrichtian is the last age of the Cretaceous period, and therefore of the Mesozoic era. ... The Mesozoic is one of three geologic eras of Phanerozoic eon. ... The Triassic is a geologic period that extends from about 245 to 202 million years ago (mya). ... Jump to: navigation, search The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ...



Millions of Years

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Cretaceous: Definition and Much More from Answers.com (2830 words)
In early Cretaceous time, egg-laying and marsupial mammals were joined by placentals, but Cretaceous mammals were in general small, and lack of color vision in most modern mammalians suggests a nocturnal ancestry and a furtive existence in a dinosaurian world.
The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e.
Pterosaurs were common in the early and middle Cretaceous, but as the Cretaceous proceeded faced growing competition from the adaptive radiation of birds, and by the end of the period only two highly specialised families remained.
Cretaceous Summary (4117 words)
Early in the Cretaceous, the climate was warm and semitropical, very much like at the end of the Jurassic period (144 million years ago).
The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65.5 Ma); as the longest period, the Cretaceous constitutes nearly half of the Mesozoic.
The Cretaceous (from Latin creta, for chalk) was named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates) found in the upper Cretaceous of Great Britain (including the White Cliffs of Dover) and adjacent continental Europe.
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