what era the earth become oxygenated
The new study pushes this boundary back even further, suggesting Earth's atmosphere became oxygenated about 3 billion years ago, more than 600 million years before the Great Oxidation Event. In turn, this suggests that something was around on the planet to put that oxygen in the atmosphere at this time.
The Cenozoic Era, which began about 65 million years ago and continues into the present, is the third documented era in the history of Earth.The current locations of the continents and their modern-day inhabitants, including humans, can be traced to this period.early every plant living today had its roots in the Cenozoic Era. During the early part of the era, forests overran most of North America. However, as the climate cooled forests died off, creating open land. Due to the widening of the oceans,sharks, whales and other marine life proliferated.