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 Ocean floor
 513 million years ago

Mean atmospheric O2
 63% of modern level

Mean atmospheric CO2
 16x pre-industrial level

Mean temperature
 7C above modern level


Paleozoic Earth - Middle Cambrian Pirania sponge on the ocean floor; Drumian Stage; Burgess Shale; sponges; metazoans; Proferia; poriferans - Natural History Illustration Geologic Time Scale

Eon: Phanerozoic
 Era: Paleozoic
  Period: Cambrian
   Epoch: Middle
    Age: Albertian*


Middle Cambrian Pirania

Pirania was a genus of primitive sponge that populated the ocean floors about 513 million years ago. The stems were hollow with bunches of long spicules attached to them.

Based upon a sketch reconstruction by J.K. Rigby from the book, The Burgess Shale by Harry B. Whittington. Published in 1985 by Yale University Press.

*AKA St Davids


Copyright Walter B. Myers. All rights reserved.

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