1. By: Andres Vargas Sergio Madrigal Federico Monge
Cretaceous Era
By: Andres Vargas
Sergio Madrigal
Federico Monge

2. Cretaceous Period Cretaceous Period lasted 71 million years.
Extinction occurred around 65.5 million years ago.
Species were mostly dinosaurs and reptiles.

3. Extinction
The Cretaceous Tertiary mass extinction took place 65 million years ago.
75% of species got extinct.
Non – avian Dinosaurs
Pterosaurs
Marine reptiles (Not all)

4. Facts
During that time, marine reptiles, ammonites, and dinosaurs were there.
Hot warm climate.
The end of this period created division between Mesozoic and Cenozoic eras.
Scientists think it could have been gradual instead of a very quick extinction.

5. Causes Scientists believe it was caused by a giant meteor.
Another theory, is that there were several strong volcanoes explosions and the ahes cover up the sun.

6. Species
Ammonites

7. Marine Reptiles