The Orosirium is a geological period within the Proterozoic eon ( Paleoproterozoic era ). Its beginning is set to about 2,050 million years ago, their end at about 1,800 million years ago. It follows the period of Rhyacium and is detached from the Statherium.


The name derives from the Greek orosiria ( German: , mountain range ' ) from. He is alluding to the widespread during this time mountain building processes that took place virtually to each of the then existing continents.

Events during the Orosirium

In the Orosirium the formation of the Vredefort crater in South Africa (before approximately 2,023 ± 4 million years ago) and the Sudbury Basin falls in front of about 1,800 million years ago, respectively, by the impact of an asteroid.

The oxygen content in the atmosphere increased in Orosirium to continue, which promoted the formation of red beds. Among the largest ore deposits that emerged during this period, include the Siberian copper deposits of Udokan.

Life is determined by prokaryotic unicellular organisms in the oceans.