Members:Elan Reyes

Steffani Zelaya

CRETACEOUS PERIOD

GEOLOGIC EVENTS• it belongs to the Mesozoic Era ( 245 – 66 million years

ago )

• Continets move toward their position as south america splits from africa.

• Widespread volcanic activity occurs

DEVELOPMENT OF LIFE• First flowering plants appear.

• Dinasours, including Tyrannosaurus rex, dominiate.

• First snakes appear.

• Mass extintion

• Mass extintion at end of period causes disappearance of many land and marine life forms, including dinasours

EVOLUTIONARY CHANGES•Evolution in plant life , specifically flowerplants related to these appeared: Willow ,Elm ,Grape ,Birch ,Maple ,Grass ,SequoiaTree

•Insects :a form of a dragonfly

•Invertebrates: Nautilus ,Sea Urchins

•Reptiles: Crocodiles, GiantTurtle

•No Mammals in this period

•Terrestrial organisms: arthropods(flies)

PLANTS ANIMALS AND OTHER ORGANISMS

• Paleontologists are constantly finding new information and artifacts .Theknowledge base grows all the time.

• •There are active digsites around the world finding new information to study about plants and animals from the Cretaceous period.•

• Amateurs find importantant fossils and help to bring additional information to the scientists

CLIMATE AND GEOGRAPHY • During the early Cretaceous period, the inexorable

breakup of the Pangaean supercontinent continued, with the first outlines of modern North and South America, Europe, Asia and Africa taking shape. Conditions were as hot and muggy as in the Jurassic,