Ptychagnostus praecurrens
Trilobite
Middle Cambrian
Burgess Shale, Stephens Formation
Field, British Columbia, Canada

Two, 5mm and 4mm on 65mm matrix.

Ptychagnostus is a trilobite genus known from the Middle Cambrian of numerous sites worldwide.  It’s been found on all continents, including Antarctica, but not Africa.  It seems to be everywhere but few specimens have reached the market.

Someone named this piece, “Two Against Nature.”