Permian Period, the geologic period that began about 280,000,000 years ago and lasted 55,000,000 years. It is named for Perm, Russia, where rocks of the period were first studied systematically. The Appalachian and Ural mountains were formed during the Permian Period, and the colorful red rocks of the southwestern United States are mostly of Permian age.
Sometimes dinosaur fossils are too large and heavy to display without damaging them. How are those enormous models built? And what makes them look so realistic?
La Brea Tar Pits, an area in Hancock Park, Los Angeles, where there is a natural accumulation of sticky asphalt derived from an ancient petroleum seep.