| Spinyplatyceras arkonense Widder Fm., Hungry Hollow Mb. Arkona, Ontario, Canada A rare example of the spines attached to the specimen. The spines are long and usually break off before burial is complete. Size: 7 cm across the photo | 
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| Spinyplatyceras arkonense Widder Fm., Hungry Hollow Mb. Arkona, Ontario, Canada A rare example of the spines attached to the specimen. The spines are long and usually break off before burial is complete. Size: 7 cm across the photo |
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