FOSSILS

Trilobite (Mrakbina cattoi) in limestone. Middle Devonian period, about 390 million years ago. Atlas Mountains. Morocco. (Collection of the Colorado School of Mines Geology Museum. Golden, Colo.)

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Trilobite (Mrakbina cattoi) in limestone. Middle Devonian period, about 390 million years ago. Atlas Mountains. Morocco. (Collection of the Colorado School of Mines Geology Museum. Golden, Colo.)

Copyright Ron Wolf/Tom Stack & Associates

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