Late Ordovician, about 450,000,000 B.P.; 1-2950 Isotelus rex; holotype specimen; collected by D.M. Rudkin et al.; Churchill, MB; 1998
This trilobite was discovered during field research on the Hudson Bay shoreline, where it lay exposed for only 1.5 hours each tide cycle. The crew worked quickly, using hammers, pry bars, and chisels to separate it from the surrounding bedrock.
Trilobites lived in ancient seas from the Early Cambrian Period (about 540,000,000 years ago). They probably ate live and dead animals on the sea floor. This trilobite may have grown so large because it lived in warm waters with ample food, as Churchill was near the equator at the time.
Trilobites are extinct arthropods that were the dominant creatures in seas of the Early Paleozoic Era. Most trilobites are up to a few centimetres long. This fossil, measuring more than 70 centimetres in length, is the largest complete specimen in the world, and is listed in the Guinness Book of World Records.
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