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
Geologic timespan.timespan_formality: Formal
Geologic timespan.lower_boundary_def: Defined chronometrically
Geologic timespan.upper_boundary_def: Defined chronometrically

via Wikipedia infobox

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Encyclopedic overview

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Contents

See also
References
Further reading

The period is characterised by the expansion of existing platform covers, and by new platforms forming on basements that were recently cratonized.

Excerpted from Wikipedia’s “Calymmian” article, available under the CC BY-SA 4.0 licence.

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