Cambrian Period, the first geologic period of the Paleozoic Era. It began 570,000,000 years ago and lasted 70,000,000 years. It is named for Wales (which the Romans called Cambria), where sedimentary rocks of the period were first recognized.
You Might Also Like
Archaeologists dig up and study the material remains of human civilizations. Bioarchaeologists do the same thing, except they focus on the remains of, well, us. What's the big deal about old bones and teeth?
A famous slogan claims that a diamond is forever. While these precious stones symbolize love and glamour for millions of couples, there's a lot about nature's most famous jewel you might not know.