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They first appeared around 521 million years ago during the Early Cambrian period at the start of the Atdabanian stage
they ruled the oceans during the late Cretaceous period
it holds particular significance as Alabama’s state mineral
where approximately 375 million tons were mined between 1840 and 1975
preserving exceptionally fossiliferous layers along with ancient deltas
0.5 Detailed Fossil March Fly Insect Green River FM Uintah County UT Eocene Age Egg Shell They first appeared around 521Location: Uintah County, Utah Weight: 1. 1 Ounces Dimensions: 1. 8 Inches Long, 1. 6 Inches Wide, 0. 4 Inches Thick (Plate) Insect Dimensions: 0. 5 Inches Long, 0. 5 Inches Wide The item pictured is the one you will receive. 50 million years old, Eocene age March Fly Insect Approximately 50 million years ago, a vast body of water known as Fossil Lake lay in what is now southwestern Wyoming. At its largest, the lake spanned nearly 930 square miles,
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