Calymmian
Also known as Calymmian Period, Calymmian System
The Calymmian (from , meaning 'cover') is the first geologic period in the Mesoproterozoic Era, lasting from to million years ago (Ma) and spanning 200 million years. It follows the Statherian Period from the Paleoproterozoic Era, and precedes the Ectasian Period. Instead of being based on stratigraphy, these dates are defined chronometrically.
Key facts
- Geologic timespan.name
- Calymmian
- Geologic timespan.color
- Calymmian
- Geologic timespan.top_bar
- all time
- Geologic timespan.image_map
- 1590 Ma.png
- Geologic timespan.caption_map
- Paleoglobe of the Earth at the start of the Calymmian,
- Geologic timespan.timeline
- Calymmian
- Geologic timespan.name_formality
- Formal
- Geologic timespan.celestial_body
- earth
- Geologic timespan.usage
- Global (ICS)
- Geologic timespan.timescales_used
- ICS Time Scale
- Geologic timespan.chrono_unit
- Period
- Geologic timespan.strat_unit
- System
~1 min read
Article
3 sectionsContents
- See also
- References
- Further reading
The Calymmian (from , meaning 'cover') is the first geologic period in the Mesoproterozoic Era, lasting from to million years ago (Ma) and spanning 200 million years. It follows the Statherian Period from the Paleoproterozoic Era, and precedes the Ectasian Period. Instead of being based on stratigraphy, these dates are defined chronometrically.
The period is characterised by the expansion of existing platform covers, and by new platforms forming on basements that were recently cratonized.