Related Overviews


More Like This

Show all results sharing this subject:

  • Earth Sciences and Geography


Quick Reference

A period of the Proterozoic eon that began 1 400 Ma ago and ended 1 200 Ma ago. Both its commencement and its end are defined by fixed dates. The Ectasian followed the Calymmian period and was followed by the Stenian period.

Subjects: Earth Sciences and Geography.

Reference entries