| Helopora inexpectata Gilbertsocrinus ohioensis Bryozoan with Crinoids Silica Shale Sylvania, Ohio Size: 11 cm across the slab. |
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| Helopora inexpectata Gilbertsocrinus ohioensis Bryozoan with Crinoids Silica Shale Sylvania, Ohio Size: 11 cm across the slab. |
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