Annularia
Encyclopedia
Annularia is a plant fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 from the Carboniferous
Carboniferous
The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...

 (around ). It is a form taxon. Its radiating structures are most likely the leaves of Calamites
Calamites
Calamites is a genus of extinct arborescent horsetails to which the modern horsetails are closely related. Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of more than 30 meters...

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