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Historic and Physical Geology

Trilobite Fossils
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From Wikipedia, the free encyclopedia: Trilobites ("three-lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites first appear in the fossil record during the Early Cambrian period (540 million years ago) and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago.

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Phacops rana is a species of Trilobite
Middle Devonian period.
Mount Stephens
Yoho National Park
2009/08/17
Photo by
Phacops rana is a species of Trilobite and
Bractrites arkonensis is a species of Cephalopod
Middle Devonian period.
Mount Stephens
Yoho National Park
2009/08/17
Photo by
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