Fossils of the Cambrian Period
Arthropods from the Burgess shale, such as the trilobite Olenoides (left) and a chelicerate called Sidneyia (right), exploded in morphological diversity following the so-called Cambrian Explosion.
(via: Live Science)            
(photo: Smithsonian Institution, Courtesy of Douglas Erwin)

Fossils of the Cambrian Period

Arthropods from the Burgess shale, such as the trilobite Olenoides (left) and a chelicerate called Sidneyia (right), exploded in morphological diversity following the so-called Cambrian Explosion.

(via: Live Science)            

(photo: Smithsonian Institution, Courtesy of Douglas Erwin)

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