What is Tonian?
The '''Tonian''' was the first [[geological]] [[Period (geology)|period]] in the [[Neoproterozoic]] [[era]]. It lasted from 1000 million years ago (mya) to 720 mya. The [[supercontinent]] [[Rodinia]] began breaking in this period. [[Acritarch]]s [[adaptive radiation|radiated]] during the Tonian. == References == * {{cite web | title=Tonian Period | work=GeoWhen Database | url=http://www.stratigraphy.org/geowhen/stages/Tonian.html | accessdate=January 5, 2006 |archiveurl = https://web.archive.org/web/20060512164244/http://www.stratigraphy.org/geowhen/stages/Tonian.html <!-- Bot retrieved archive --> |archivedate = May 12, 2006}} {{science-stub}} {{Geologic History}} [[Category:Neoproterozoic]]