Cretaceous

The cretaceous was a period of the Earth history, that started when Jurassic finished (145 milions years ago) and ended with the beginning of the Paleocene (66 milions years ago). The end of Cretaceous mark the limit between Mesozoic and Cenozoic.

The end of the period was very evident, because we can see a layer that's relacionated with the Chicxulub in Yucatan and the Mexico Gulf.
That layer it was detated 66 milion years ago. The impact of the meteorite is probably the cause of the extinction of Cretaceous. That layer is called KT (The cretaceous-tertiary).
In this extinction the most affected ecosystem was the ocean, one 95% spices was died.

The cretaceous derived from the Latin creta "chalk" it was called like this because there were big layers of chalk in this period, that we can see in the fossils of the sea invertebrate animals.

The cretaceous is divided into Early Cretaceous and Late Creataceous

CLIMATE- Tempeatures reached his highest point, this caused desglaçaments, although the tempeature was not higher then the Triassic and Jurassic. Which help to reduce the sea currents and the water was stagnant.

FAUNA- Apperence of bees, ants and butterflies. Dinosaurs were the rulers of the land. Pteosaurs had fierce competiton with birds.

During the Cretaceous, the supercontinent Pangea ended fragment in the present continents, although Their position was very different from today's. These divisions were created long underwater mountain ranges raise sea levels around the world.

The first representatives of modern trees, including figs, bananas and magnolias, emerged during the Cretaceous.

The mass extinction that defines the end Cretaceous that he lost a significant number of species (~ 50%) and households (~ 25%). The plants suffered almost no casualties, while marine organisms received the hardest blow, including the vast majority (~ 95%)