A pink sponge, photographed at an aquarium today, is not unlike one of the first life forms that appeared in the Precambrian era. Photograph by Joel Sartore, National Geographic Photo Ark The ...

Hadean Era (4,550-3,850 mya) The Precambrian's oldest era ... and various asteroids -- forms from interstellar gas and dust. Prelude to life (4,550-3,900 mya) Planet Earth is very hot at its ...

The Royal Tyrrell Museum has a new exhibit that explores fossils from the Precambrian era. It explains how ... oceans began to form, and the first life appeared. The exhibit officially opened ...