Double Pyritized Triarthrus Rougensis - Rare

Here's a species that doesn't appear for sale very often, Triarthrus rougensis from the Billings Shale near Ottawa. There are two (and a half) multi-colored, pyritized Trirathrus on the plate. The larger on is .85 inches long, centered in the middle of the matrix and is an exception specimen of this species. This piece is a gorgeous example of this rarely seen type of Triarthrus.