SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Trilobite fossil. Fossil of the trilobite Ptychagnostus praecurrens. The trilobites are an extinct group of marine arthropods with a hard, segmented shell divided into 3 sections. Most were bottom dwellers, feeding and living on organic sediment on the ocean floor. This fossil was found in the Burgess Shale, a rock formation in Yoho National Park, British Columbia, Canada. The Burgess Shale dates from the middle Cambrian period (approximately 540 million years ago). It is well known for the wide diversity of soft- bodied invertebrates which are preserved in it.
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