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 Ocean floor
 510 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 - Olenoides serratus (trilobite) on the ocean floor; Drumian Stage; Burgess Shale; metazoans - Natural History Illustration Geologic Time Scale

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


Olenoides serratus (trilobite)

A trilobite from the species Olenoides serratus scurries across a Middle Cambrian ocean floor about 510 million years ago. The best-known trilobite from the Burgess Shale, Olenoides serratus grew to be about four inches long and shares the scene with two kinds of diminutive sponge: the smaller branching sponges are from the genus Vauxia, while the larger corrugated tubular sponges are from the genus Wapkia.

*AKA St Davids


Copyright Walter B. Myers. All rights reserved.

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