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Calymmian

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From Wikipedia, the free encyclopedia

First period of the Mesoproterozoic Era

Calymmian

1600 – 1400Ma

Paleoglobe of the Earth at the start of the Calymmian,c. 1590 Mya^[citation needed]

Chronology

−1620 —

–

−1600 —

–

−1580 —

–

−1560 —

–

−1540 —

–

−1520 —

–

−1500 —

–

−1480 —

–

−1460 —

–

−1440 —

–

−1420 —

–

−1400 —

–

−1380 —

Mesoproterozoic

Statherian

Calymmian

Ectasian

←

Breakup of the supercontinentColumbia

←

“Gaoyuzhuang biota” emerges, earliestArchaeplastida?

Events of the Calymmian Period.
Vertical axis scale:Millions of years ago

Etymology

Name formality

Formal

Usage information

Celestial body

Earth

Regional usage

Global (ICS)

Time scale(s) used

ICS Time Scale

Definition

Chronological unit

Period

Stratigraphic unit

System

Time span formality

Formal

Lower boundary definition

Defined chronometrically

Lower GSSA ratified

1990^[1]

Upper boundary definition

Defined chronometrically

Upper GSSA ratified

1990^[1]

TheCalymmian Period (fromAncient Greek:κάλυμμα,romanized: kálymma, meaning 'cover') is the firstgeologic period in theMesoproterozoic Era and lasted from 1600 to 1400 Mya (million years ago). Instead of being based onstratigraphy, these dates are definedchronometrically.

The period is characterised by the expansion of existingplatform covers, and by newplatforms forming onbasements that were recentlycratonized.

Thesupercontinent ofColumbia started to break up during the Calymmian some 1500 Mya. TheVolyn biota have also been dated to 1500 Mya.

A reconstruction ofGrandilingulata qianxiensis, a macrofossil from the CalymmianGaoyuzhuang Formation

References

[edit]

^^a ^bPlumb, Kenneth A. (June 1991)."New Precambrian time scale".Episodes.14 (2):139–140.doi:10.18814/epiiugs/1991/v14i2/005.eISSN 2586-1298.ISSN 0705-3797.LCCN 78646808.OCLC 4130038.

Permian(252–299 Ma)	Lopingian (252–260 Ma) Guadalupian (260–272 Ma) Cisuralian (272–299 Ma)
Carboniferous(299–359 Ma)	Pennsylvanian (299–323 Ma) Mississippian (323–359 Ma)
Devonian(359–419 Ma)	Late (359–383 Ma) Middle (383–393 Ma) Early (393–419 Ma)
Silurian(419–444 Ma)	Pridoli (419–423 Ma) Ludlow (423–427 Ma) Wenlock (427–433 Ma) Llandovery (433–444 Ma)
Ordovician(444–485 Ma)	Late (444–458 Ma) Middle (458–470 Ma) Early (470–485 Ma)
Cambrian(485–539 Ma)	Furongian (485–497 Ma) Miaolingian (497–509 Ma) Series 2 (509–521 Ma) Terreneuvian (521–539 Ma)

Proterozoic Eon
(539 Ma–2.5 Ga)

Neoproterozoic(539 Ma–1 Ga)	Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga)
Mesoproterozoic(1–1.6 Ga)	Stenian (1–1.2 Ga) Ectasian (1.2–1.4 Ga) Calymmian (1.4–1.6 Ga)
Paleoproterozoic(1.6–2.5 Ga)	Statherian (1.6–1.8 Ga) Orosirian (1.8–2.05 Ga) Rhyacian (2.05–2.3 Ga) Siderian (2.3–2.5 Ga)