(Internal #F-422-I) You are bidding on this natural, Ammonite, from the Upper Cretaceous, 120 million years old.  Average between 5/8" to 1" diameter.

Locality: SOUTH DAKOTA, USA
Stratigraphy: 
PIERRE SHALE

Ammonites went exticnt with the dinosaurs, and are marine animals in the subclass: Ammonoidea, class: Cephalopoda, and phylum: Mollusca.  Ammonites are excellent index fossils, making it easier to link the rock layers to a specific time period of which they are found.

Ammonites' closest living relatives are the octopus, squid, and cuttlefish.

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