Fern fossils may be found in rocks that were deposited during both the Carboniferous and Permian Periods as impressions, compressions, casts and molds.
Pecopteris sp.PTC-18; Fern; Pennsylvanian; Locality unknown; CC BY-NC-ND 4.0
Pecopteris sp.
Pecopteris sp.OPC 3011-416; Fern; Middle Pennsylvanian (Desmoinesian); Cabaniss Group, Senora Formation, Henryetta Coal roof shale; Okmulgee County, Oklahoma; CC BY-NC-ND 4.0
