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.
Before the existence of radiocarbon dating, archaeologists would hope their prized potsherds happened to lie buried next to a dated coin. How has the measurement of C-14 and C-12 revolutionized the science of archaeology?
When some people hear the word "dinosaur," they immediately think of outdated technology. Does that mean that the dinosaurs themselves were failures?