Medullosan fossils may be found in rocks that were deposited during both the Pennsylvanian and Permian Periods as impressions, compressions, casts and molds.
Neuropteris sp.OPC 3016-1475; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Seminole Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp.
Neuropteris sp.OPC 3019-1483; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Coffeyville Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp.
Neuropteris sp.OPC 3020-1492; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Seminole Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp.
Neuropteris sp. (Macroneuropteris scheuchzeri)OPC 3016-1476; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Seminole Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp. (Macroneuropteris scheuchzeri)
Neuropteris sp.OPC 3019-1488; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Coffeyville Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp.
Neuropteris sp.OPC 3016-1473; Medullosan (Seed Fern); Middle Pennsylvanian (Desmoinesian); Skiatook Group, Seminole Formation; Tulsa County, Oklahoma; CC BY-NC-ND 4.0
Neuropteris sp.
Alethopteris sp.PTC-5; Medullosan (Seed Fern); Pennsylvanian; Locality unknown; CC BY-NC-ND 4.0
Alethopteris sp.
Trigonocarpus sp.OPC 3238-14063; Medullosan (Seed Fern); Pennsylvanian; Schuylkill County, Pennsylvania; CC BY-NC-ND 4.0
