| Dolatocrinus asterias Platyceras sp. Alpena Limestone Alpena, Michigan This specimen has a Platyceras sp. sitting on the tegmen. Size: 2.7 cm across the calyx. | 
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| Dolatocrinus asterias Platyceras sp. Alpena Limestone Alpena, Michigan This specimen has a Platyceras sp. sitting on the tegmen. Size: 2.7 cm across the calyx. |
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