These are among the earliest of trilobites, dating from the Lower Cambrian and collected(not by me) in Lincoln County, Nevada. All are members of the genus Olenellus. From head to tip[ of tail spine, these range from 1 1/4"-2 1/4".
Olenellus gilberti:
Olenellus chiefensis:
This next O. chiefensis conveys a sense of motion, with its' tail swept upward and recurved.
Olenellus fowleri:
Olenellus gilberti:
Olenellus chiefensis:
This next O. chiefensis conveys a sense of motion, with its' tail swept upward and recurved.
Olenellus fowleri:
Comment