| Aulopora microbuccinata Silica Shale Sylvania, Ohio Encrusted on the Paraspirifer bownockeri brachiopod. Size: 6 cm across | 
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| Aulopora microbuccinata Silica Shale Sylvania, Ohio Encrusted on the Paraspirifer bownockeri brachiopod. Size: 6 cm across |
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