Hello friends and TFF family!
Another little palaeozoic problem.
This was given to me back in the mid 1980s and was said to be from the Pentamerus Grits of Newlands, Girvan, Ayrshire, Scotland.
Brrrrrrrr!!!!!!
I have it marked down only as "Cystoid?" and it may well be. The hexagonal patterned bit down the edge of the rock including the smooth shell like piece is 2.2 cm long.
Bad picture. Here is a better close up.
You can kind of see above that the hexagons are lying on the surface of the smooth bit, which i once thought was a bit of Pentamerus oblongatus but now think it may be some sort of inner layer of the fossil to which the hexagons are attached.
Clearer below :
Any ideas would be most welcome!
@piranha
@TqB