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Cretaceous Period. The Cretaceous period was named for the immense chalk formations that blanket much of northwestern Europe and the main components of this chalk are calcareous nannofossils. By Bob StraussMar 07 20088 mins to read.
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The Cretaceous derived from the Latin creta chalk usually abbreviated K for its German translation Kreide chalk is a geologic period and system from circa 145 4 to 66 million years Ma ago. The climate was also more equable in that the temperature difference between the poles and the Equator was about one-half that of the present. Cretaceous Period in geologic time the last of the three periods of the Mesozoic EraThe Cretaceous began 1450 million years ago and ended 66 million years ago.
By Mary BagleyJan 08 20169 mins to read.
Scurrying between the feet of fearsome meat eaters such as Tyrannosaurus and Spinosaurus were many types of early mammal some of which as youll find out below were even big enough to eat small dinosaurs. Following their rapid surge in abundance at the end of the Jurassic eg Caselleto et al 2008 calcareous nannofossils remained ubiquitous throughout the Cretaceous. By the end of this period 66 million years ago dinosaurs will be extinct. There was a tremendous diversity in dinosaur species.
