| Paraspirifer bownockeri Mediospirifer audaculus Silica Fm. Sylvania, Ohio Size: The piece is about 11 cm across. This combination of the Mediospirifer sitting on top of the Paraspirifer is natural. The Mediospirifer lived on the Paraspirifer. Sometimes multiple Mediospirifers lived on the Paraspirifer. Many specimen of this combination have been found but this combination is still rare compared to the number of Paraspirifer that have been found. There is also a chunck of marcasite/pyrite attached to the Paraspirifer. Price: $75 US ID number: fs667 | 
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