Eocene Climbing Fern from Green River Formation

Name: Lygodium kaulfussi

Kingdom: Plantae; Division: Pteridophyta; Class: Pteridopsida; Order: Schizaeales; Family: Schizaeaceae

Geological Time: Early - Middle Eocene

Size: Leaf: 33 mm by 31 mm Matrix: 78 mm by 72 mm

Fossil Site: Green River Formation, Uintah County, Utah

Climbing Fern Plant FossilsThe Green River Formation deposits of Wyoming, Colorado, and Utah are best known for their immaculately preserved fish, but other examples are known as well, as this specimen attests. This is an example of the Schizaeaceae (Curly Grass Family) family. The brown color is a fine contrast to the light shale matrix. The extant examples are true climbers that twine 60-90 cm high on saplings along watercourses from Florida to New England, as a result of introduction from native locations in Europe and Asia. This is a remarkably detailed example showing the venation quite clearly.

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