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.
Hieroglyphics used to be a language that no one -- Egyptian or otherwise -- could decipher. With the help of the Rosetta Stone, that all changed.
You have to dig deeply to uncover the foundations of archaeology. What started as a treasure hunt gradually transformed into a science where every potsherd counts for something. Who were the game changers in archaeology?