"Pecopteris” oregonensis Tree Fern Fronds

"Pecopteris” oregonensis

Geological Time: Pennsylvanian (~320 m.y.a.)

Size (25.4 mm = 1 inch): Matrix: 125 mm by 135 mm

Fossil Site: Spotted Ridge Formation, Oregon

Fossil Code: RS88

Price: Sold


Tree Fern FossilsDescription: The Pteridophyte (tree fern) Psaronius became a dominant form supplanting the lycopds. The leaf fronds and pinnules of Psaronius were given the form genus designation of Pecopteris, a highly variable form whose classification is still under review. While this one has been referred to the genus Pecopteris, recent work has shown the internal structure not to be like the Marriatales, but rather the family Zygopterales. If correct, it will have to be given a different genus name. Whatever the correct name, this one is a fine example with several fronds preserved.

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