Temporal range: Carboniferous
Annularia is a plant fossil from the Carboniferous (around ). It is a form taxon. Its radiating structures are most like the leaves of Calamites. Annularia are the leaf whorls of an extinct horsetail. Their stems were also like the stem of Calamites. These horsetails, Sphenopsida, grew to a height of 32 feet(10 meters) in a tree-like form.
1. Annularia sp. Mazon Creek Fossils
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