A time capsule to the dinosaur age, dawn redwoods trees are growing in Michigan ... the species of tree has existed since dinosaurs roamed the earth. The redwoods were once believed to be extinct.

The Jurassic Period is one of the three prehistoric geological periods of the Mesozoic Era. It spans from 145 million to 201 ...

Small fossils show mammals moved to the ground before the dinosaurs vanished. New plants changed habitats, giving better food and shelter.