The Cretaceous Period -65 milllion to -145 million

The Cretaceous Period was the last and longest segment of the Mesozoic Era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic Period about 145.5 million years ago to the Cretaceous-Paleogene (K-Pg) extinction event dated at 65.5 million years ago



Tricertops

TIME - 70 - 65MYA, Late Cretaceous period.RANGE - USA Montana, N. Dakota, S. Dakota, Wyoming, Colorado. CANADA - Alberta.SIZE - Up to 30Ft (9m) long.WEIGHT - 2 US tons.

T-Rex

TIME - 70 -65 MYA, Late Cretaceous period.RANGE - USA: Colorado, Montana, N Dakota, New Mexico, Wyoming.CANADA - Alberta, Saskatchewan.SIZE - 15 ft(5m) tall and 36 ft (12m) long.WEIGHT - 6.5 US tons. 

The Jurassic Period

Great plant-eating dinosaurs roaming the earth, feeding on lush ferns and palm-like cycads and bennettitaleans … smaller but vicious carnivores stalking the great herbivores … oceans full of fish, squid, and coiled ammonites, plus great ichthyosaurs and long-necked plesiosaurs … vertebrates taking to the air, like the pterosaurs and the first birds. This was the Jurassic Period, 199.6 to 145.5 million years ago*

TRIASSIC PERIOD 248-208 Million Years Ago

As the Mesozoic era begins, we see the rise of the what is known as the dinosaurs. Pterosaurs (flying reptiles) also made their first appearance here as well as frogs, turtles, and crocodiles. During the Late Triassic period, many small mammals also arose.