Rhyacian

The Rhyacian is the second geological period in the Palaeoproterozoic that began 2.3 billion years ago, and ended at 2.05 billion years ago. Before it was the Siderian It is followed by the Orosirian.

The Huronian (Makganyene) global glaciation began at the start of the Rhyacian. It lasted until 2200 million years ago.

The first known eukaryotes began to evolve in the Rhyacian period. The multicellular Francevillian Group Fossils, at 2.1-Gyr-old are from the Rhyacian period, as well as the enigmatic fossil Diskagma.

 References 

Category:Palaeoproterozoic