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Ammonites are an extinct group of marine invertebrate animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids than they are to shelled nautiloids such as the living Nautilus species.
Fossil Fern- "Fossil Fern This is a fossil fern that I found in Russellville AR and its from the Pennsylvanian, an era within the Carboniferous, which was about 300 million years ago, rounded off of course. I believe it to be a neuropteris fern."