Orthoceras was a horn like cephalopod that’s flourished 500 Million Years ago, going extinct 200 million years ago! Related to the squid and octopus family! 
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These pieces are about 2 to 2.5 inches length,  about 1inch wide ; and 1/4 inch thick. 
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This listing is for 1 Orthoceras Fossil.

Small Orthoceras Fossil

$4.99Price