The Cretaceous Period 140 million to 65 million years ago

Where did the name of The Cretaceous time period come from? Its Latin, noting or pertaining to a period of the Mesozoic Era, characterized by the greatest development and later extinction of dinosaurs and the advent of flowering plants and modern insects.

In the early Cretaceous, the continents were in very different positions than they are today. Sections of the super continent Pangaea were starting to drift apart.

  • The climate? warm, resulting in high sea levels that created shallow inland seas, cold weather and snow was almost non-existent aside from the tallest mountains.
  • Life forms? the first flowering plants occurred, great and small dinosaurs continued to roam throughout forests of ferns, cycads and conifers. Because of the almost worldwide tropical climate, the possibility of dinosaurs being cold or warm blooded were both possible.

One of the reasons scientists believe that the dinosaurs were able to grow so big was because the atmosphere was incredibly rich in oxygen.

Major extinction ended the time period- end of the dinosaurs- 65 million years ago

The asteroid ended the time period hitting the surface of the Earth off the Yucatan Peninsula, Mexico. The hit nearly wiped out half of the worlds populations.

Many groups of organisms, such as flowering plants, snails, clams, amphibians, lizards and snakes, crocodiles, and mammals "sailed through" the Cretaceous-Tertiary boundary, with few or no apparent extinctions at all.

Smith, David. "The Cretaceous Period." The Cretaceous Period. University of California Museum of Paleontology, 15 June 2011. Web. 20 Mar. 2017. <>.

Anthony, Sebastian. "Finally Confirmed: An Asteroid Wiped out the Dinosaurs." Extremetech. N.p., 8 Feb. 2013. Web. <>.

Bagley, Mary. "Cretaceous Period: Animals, Plants & Extinction Event." Live Science. N.p., 7 Jan. 2016. Web. 7 Jan. 2016.


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