These are Elrathia Kingi trilobites from the House Range in Millard County, Utah.
The specimens pictured are exactly the pieces you would receive based on your sellection.
Trilobites are a well-known fossil group, probably the second best known fossil group in the world (behind dinosaurs). These Utah specimens are from the mid- Cambrian period about 550 million years ago.
As a species, trilobites disappeared from earth in a mass extinction event at the end of the Permian period about 250 million years ago.
Trilobites were a group of Arthropods, segmented bodies and limbs, with hard shells. Extinct today, over 15000 species have been classified to date, ranging in size from 1mm - 700mm long
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