So, I found a large complete Oyster at Poricy Park, NJ and was cleaning it as gentle as I could as it is very fragile but after a while of running warm water over it the two halves separated in it was nothing but hardened mud, silt or clay of some sort. But inside to one edge of the shell against the bottom half was something hard, not round but triangular in shape with about 1/2” sides. This was the only thing found within the two halves except for the very fine sediment.
Opinions??
Thank you.