Fossil of a trilobite

The structure of a trilobite, including the antennae and legs, can be seen in the Burgess Shale, a rock formation found in the Canadian Rockies in 1909.

This trilobite lived some 505 million years ago. Trilobites were a class of ocean-dwelling artrhopods that first emerged some 540 million years ago and became extinct at the end of the Permian period 250 million years ago. Trilobites had a hard exoskeleton made of minerals, and these exoskeletons were frequently preserved as fossils. Scientists have identified some 17,000 species of trilibites from the fossil record.

The Burgess Shale contains a vast fossil record that provided the first glimpse into the diverse animal life of the Cambrian Period (542-488 million years ago).

<img typeof="foaf:Image" src="http://statelibrarync.org/learnnc/sites/default/files/images/leggedtrilobite2.jpg" width="1114" height="1150" alt="Fossil of a trilobite" title="Fossil of a trilobite" />
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