Jurassic Period, the geologic name given to the middle period of the Mesozoic Era, between the Triassic and the Cretaceous periods. The Jurassic period began about 200,000,000 years ago and lasted about 65,000,000 years. The name Jurassic is derived from the Jura Mountains, where rocks formed during this period are found. In the United States, outcrops of rocks of the Jurassic period are found only west of the Mississippi River. Most of the rocks of this period are marine deposits (shale, sandstone, and limestone) containing a large number and variety of fossils. Dinosaurs and flying reptiles lived during this period and the first known birds appeared.
Decades of fossil discoveries have revealed much about the extinct members of our hominid family tree, but we're far from having all the answers. What have we learned from some of these fascinating finds?
When it comes to fossils, specimens like Sue the Tyrannosaurus rex grab much of the attention. And while Sue is a staggering 67 million years old, she's a new kid on the block, compared to some of the oldest fossils ever found. What's older than Sue?