Neoproterozoic

One of the defining events of the Neoproterozoic was the breakup of Rodinia, which began around 800 million years ago. This tectonic shift drastically altered Earth’s geography, creating new oceans and influencing global climate patterns. This period is also known for the “Snowball Earth” hypothesis, which suggests that the Earth underwent extreme glaciations, with ice possibly covering the entire planet. Evidence for these events comes from glacial deposits found in tropical latitudes, a phenomenon only explainable by global-scale glaciation.

Biologically, the Neoproterozoic is significant for the rise of multicellular life, particularly the enigmatic Ediacaran fauna, which represent some of the earliest known animals. These soft-bodied organisms lived in shallow marine environments and are preserved in fossil beds around the world, including in Australia, Namibia, and Canada. The exact relationship of these organisms to modern animal lineages remains debated, but they mark a significant increase in biological complexity, preceding the Cambrian explosion of life.

The Neoproterozoic also saw an increase in oxygen levels, which may have been a driving factor in the evolution of complex life. Oxygen concentrations likely rose due to the burial of organic carbon, allowing for the oxygenation of shallow marine environments where early animals thrived.