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Annularia Calamites Cross-Section Replica measures 3.1 inches. Annularia Calamites Cross-Section Replica is museum quality polyurethane cast. Made in USA. Annularia is a form taxon. It is the name given to Calamites leaves. In fact the stems and the radiating structures of the leaf whorls is similar in the Calamites, an extinct genus of horsetails. Fossils of this genus have been discovered in the Permian strata of Russia and in the Carboniferous (around 360 to 300 million years ago) strata of the United States, Canada, China and Europe. Pennsylvanian. Mazon Creek, Illinois.
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