When hunting the Peace River, I find some - many Ray dermals of this general form (not quite as pristine as these phosphate mine versions:
I have been finding more of the little "buttons" recently, maybe 5-10 a hunting day.
When in the productive areas, I find lots of these which I always thought of base plates for attaching bottom of Ray spines.
The I ran into something that I have definitely NOT seen previously. Less than the size of a pe