One problem is high sea levels. During the start of the Jurassic, ocean levels were lower than they are today, but then they rose significantly over the period. This means there aren’t as many places ...

During this period ... This was the Jurassic, which took place 199 to 145 million years ago. At the start of the period, the breakup of the supercontinent Pangaea continued and accelerated.

The footprints, which date back to 166 million years ago during the Middle Jurassic Period, form multiple massive trackways that researchers call a "dinosaur highway." In June, researchers and ...