Devonian Marine Fossils

It's amazing what you find with magnification. These fossils are each less than an inch across. It was only after I photographed them and looked at the picture enlarged on my desktop that I could see the remains of the brachiopod shell clinging to the lower valve and the tiny spines protruding from it, along with the holes left by spines on the upper valve impression. Closer inspection reveals that the gastropod is not a mold but rather that shell itself. There is a a break on the bottom whorl where you can clearly see the edge of the shell. If you are looking at a small phone screen right now, come back to this picture and look at it on a big screen!
Brachiopod (Productella tullia) and gastropod (Ruedemannia trilix)
Middle Devonian
Upper Ludlow Formation
Avoca, New York

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