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Cambrian Period
541–485.4 million years aby
Mean atmospheric O
2
content ower period duration
c. 12.5 vol %
(63 % o modren level)
Mean atmospheric CO
2
content ower period duration
c. 4500 ppm
(16 times pre-industrial level)
Mean surface temperatur ower period duration c. 21 °C
(7 °C abuin modren level)
Sea level (abuin present day) Risin steadily frae 30m tae 90m[1]
Key events in the Cambrian
-550 —
-540 —
-530 —
-520 —
-510 —
-500 —
-490 —
 
 
 
 
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Orsten Fauna
Archaeocyatha extinction
SSF diversification, first brachiopods & archaeocyatha
Treptichnus pedum trace
Lairge negative peak δ 13Ccarb excursion
First Cloudina & Namacalathus meeneral tubular fossils
Stratigrafic scale o the ICS subdiveesions an Precambrian/Cambrian boondar.

The Cambrian Period wis the first geological period o the Paleozoic Era, o the Phanerozoic Eon.[2]

ReferencesEedit

  1. Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science. 322 (5898): 64–8. Bibcode:2008Sci...322...64H. doi:10.1126/science.1161648. PMID 18832639. 
  2.   Chisholm, Hugh, ed. (1911). "Cambrian System". Encyclopædia Britannica (11th ed.). Cambridge University Press.