The term Jurassic it is used in the field of geology to allude to period what it started 208 million years ago and extended until 144 million years ago . As an adjective it is written in lowercase (Jurassic ), while if it is used as a noun it must be written with an initial capital letter (Jurassic ).
The Jurassic is the second period of the mesozoic era . This geological era, which began 230 million years ago and ended 65 million years ago, begins with the triassic period , continue with the Jurassic and ends with the Cretaceous .
In the Jurassic, birds and animals appeared mammals . There was also the division of Pangea , the supercontinent whose fracture resulted in the emergence of Gondwana and Laurasia , two continental blocks separated by the ocean Thetis .
One of the main characteristics of the Jurassic is the rise and diversification of dinosaurs . In this period many species increased their size and predators developed new hunting methodologies.
Among the various geological periods, the Jurassic is the best known at the popular level, at least by name, thanks to a novel and its subsequent film adaptation that resulted in a franchise: "Jurassic Park" (or in English, “Jurassic Park” ). The book was written by Michael Crichton and published in 1990 , while the first film was directed by Steven Spielberg and premiered in 1993 . Thanks to these works , occurred in the decade of '90 a fury for dinosaurs, which began to arouse enormous interest in children and adults.