What is the Cretaceous

What is the Cretaceous


  • 1 Cretaceous age 1.1 Plants of the Cretaceous 1.2 animals of the Cretaceous
  • 1.1 Plants of the Cretaceous
  • 1.2 animals of the Cretaceous
  • 2 the end of the Cretaceous
  • 3 out of the label
  • 4 References

Cretaceous age

Cretaceous age or Cretaceous, is the period between (145.5 and 65.5) million years ago, the last period of the Mesozoic, after age Ajawarsa (the era of dinosaurs), and ended the Cretaceous extinction of dinosaurs except birds of them. At the beginning of the Cretaceous period was a continent Banega giant (the continent's mother), has begun Balthqq, and in the mid-Cretaceous period was divided into several small continents, resulting in geographical isolation and widespread occurrence of scale, and the difference in the evolution of things life beings and peoples in the new territories, and the establishment of lines of coastal new, climate became much colder, and the forest has evolved and emerged a new species of plants and trees grew walnut, oak trees, tree magnolia. [1]

Plants of the Cretaceous

Marked the Cretaceous revolution in the life of plants, where flowering plants emerged (angiosperms) suddenly, such as beech trees, fig, tree magnolia tree Alsasfras, and became these plants spread clearly by the end of the Cretaceous period, and these trees are also willow, tree elm, laurel, grapes, oak, maple, along with grass, tree sequoia. [2]

Animals of the Cretaceous

Was associated with insect appearance in this era largely plants angiosperms, and these dragonflies insects, and was most insects in that era similar to insects today, and this paved the way for the emergence of mammals in the late era Alsnzukih (modern era), and included invertebrate marine, such as: seashells, lobster, crabs, sea urchins, and foraminifera, featured reptiles, including dinosaurs of various kinds, carnivorous and herbivorous, such as: Triceratops and Tyrannosaurus, and stegosaurus, and Apatosaurus, and Iguanodon, marine, such as: Alaktaousour, and Alblazousour, and Mozassour. dinosaurs [2]

The end of the Cretaceous era

Earth hit an asteroid on the peninsula of Yucatan in Mexico specifically, 65 million years ago, which today is called the impact crater Cheksholub, which led to the extinction of half of the types of objects in the world at that time, and some believe that many species have become extinct before hitting the asteroid of the Earth , it may be due to environmental changes that have occurred at that time, regardless of the cause of their extinction, the extinction is the end of the Cretaceous period. [1]


Derived from the name Kretesy Latin word meaning Creta chalk, chalk is a type of limestone, most of which have been deposited during Alasratabachere, which provide scientists with information about the current era of life in previous eras. [3]


  • ^ أ ب "The Cretaceous Period", www.ucmp.berkeley.edu, Retrieved 14-11-2017. Edited.
  • ^ أ ب "Cretaceous Period", www.encyclopedia.com, Retrieved 14-11-2017. Edited.
  • ↑ Thor Arthur Hansen, Carl Fred Koch, "Cretaceous Period"، www.britannica.com, Retrieved 14-11-2017. Edited.


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