FOSSILS

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