Here is a "Trilobite Plate" from the Wheeler Shale of Utah with servile specimens of Elrathia kingi together with a "Agnostid Trilobite" of the species Ptychagnostus atavus. The large Elrathia kingi is about 22 mm long, the Ptychagnostus atavus is about 5 mm long. | |||
Location: | Millard Co., Utah, USA | ||
Size trilobite plate: | about 76 x 55 mm | ||
Age: | Middle Cambriun, Wheeler Fm. (about 518 Mill. Y.) |