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women's t-shirts prehistoric women's t-shirts historic women's t-shirts historical women's t-shirts history women's t-shirts illustration women's t-shirts flora women's t-shirts plant women's t-shirts root women's t-shirts extinct women's t-shirts paleozoic women's t-shirts palaeozoic women's t-shirts era women's t-shirts phanerozoic eon women's t-shirts calamite women's t-shirts calamites women's t-shirts

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Paleozoic flora, including calamites. From "Figures of Characteristic British Fossils" by W. H. Baily, 1867. A calamite is any member of the lineage of giant horsetails, which belonged to the Sphenopsida, an important part of late Paleozoic vegetation. Calamites grew to be tree-sized plants with but with whorled branches seen in modern horsetails. A calamite root can be seen at top right. The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon, spanning from roughly 541 to 252.17 million years ago.