Two Pyritized Triarthrus Trilobites With Appendages - New York

The localities that preserve trilobites with soft bodied preservation can probably be counted on one hand. One of these localities is the historic Beecher's beds in the Lorraine Group of NY. Less than a decade ago a new locality was discovered a short distance away that has produced amazing, soft bodied preservation of trilobites and other organisms. Because of the rapid burial of the trilobites, in an anoxic environment the soft body parts were replaced by pyrite preserving details not typically seen.

Here are a pair of dorsally preserved Triarthrus eatoni trilobites with appendages from this locality. The larger specimen is .6" long and the smaller .36"