Mean atmospheric O2
Geologic Time Scale
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.
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