Ediacaran, which ranged from 635 million to 541 million years ago.

https://phys.org/news/2015-11-earth-ecosystems-complex-previously-thought.html

Ediacaran, which ranged from 635 million to 541 million years ago.

The most impressive organisms not mentioned by today’s “bought” pseudo-scientists are cyanobacteria. These photosynthetic marvels ALONE turned earth’s early poisonous atmosphere into what it is today. They paved the way for plant life. And then came more complex life forms.

The ability of this photosynthetic organism to dramatically change the earth’s early atmosphere without the aid of plants reveals how powerful an influence they had and can still have. The good news is this: Even if we destroy most of our rain forests and pump loads of CO2 into the atmosphere, this organism ALONE can handle it and keep our atmosphere in balance. Doing so is a far easier task than taming a poisonous atmosphere. More CO2 means more cyanobacteria, means more oxygen, means more interaction with excessive methane. Every educated, HONEST climatologist should know this. Why the silence? Are they all in the pockets of corrupt politicians?

Read more at: https://phys.org/news/2015-11-earth-ecosystems-complex-previously-thought.html#jCp