(Internal #F-424-i) You are bidding on this natural, Ammonite, from the Upper Cretaceous, 120 million years old. Average between 1-1/8" to 1-1/2" 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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