Historians and Scientists, did research for years and years. What happened during the Precambrian Era, nobody had a clue. Until humans researched the resources left behind. Back in the Precambrian Era . Earth was born. 4.6 million years ago, not even that many.! Stars and the planets were too! Rocks and much more formed on land. They are very old also known as “ancient.” The oldest rock were from Western Australia, known as Zircon Crystals. Finally oxygen and other natural elements have risen. The ozone layer also formed.
After the Precambrian Era,