| This plate from the Latham Shale shows two huge trilobite heads of Mesonacis fremonti. The species Mesonacis fremonti is might also referd as Olenellus fremonti.
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Location: | San Bernardino County, California, USA | ||
| Size Trilobite: | about 68 & 65 mm wide | ||
| Age: | Lower Cambrian, Latham Shale Fm. (about. 520 years) | ||