| Placoblastus obovatus Thunder bay Fm. Alpena, Michigan Size: The blastoid is about 3.5 cm tall. The base of this specimen is missing. Price: $20 US ID number: fs795 | 
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| Placoblastus obovatus Thunder bay Fm. Alpena, Michigan Size: The blastoid is about 3.5 cm tall. The base of this specimen is missing. Price: $20 US ID number: fs795 |
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