Claim: The subclass Equisetidae, of the Class Polypodiopsida, dates back at least to the Early Cretaceous period (145 Ma to 100.5 Ma).
Evidence: Equisetidae is one of the four subclasses of Polypodiopsida (ferns), a group of vascular plants with a fossil record going back to the Devonian. The Devonian (/dɪˈvoʊ.ni.ən, də-, dɛ-/ dih-VOH-nee-ən, də-, deh-) is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya. 
Equisetidae
Temporal range: Late Devonian to Recent
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