Siderian (Geological periods 🌍)

The Siderian Period is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma. Instead of being based on stratigraphy, these dates are defined chronometrically. The deposition of banded iron formations peaked early in this period. These iron-rich formations were formed as anaerobic cyanobacteria produced waste oxy...

https://en.wikipedia.org/wiki/Siderian

#Siderian #Paleoproterozoic #GeologicalPeriods #ProterozoicGeochronology