Due to glaciers, a field stone in Ontario could have come from any
number of source areas, so it's hard to guess what a likely age would
be.  An easy way to tell it's a brachiopod is the fact that the valves
are top and bottom (plane of symmetry goes through the shells) rather
than left and right, as in bivalves.  The end of the beak, pointing
down in the picture, often has an obvious hole in brachiopods.  More
specifically, the fossil is an articulate brachiopod, but that doesn't
narrow it down much.  Another angle or two would help show the shape
and sculpture.

--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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