Polished Full Round Petrified Tree Fern- Psaronius. Found in a creek bed, Athens Co. Pennsylvanian Age (Upper Carboniferous). The item “Rare Petrified Wood Psaronius Tree Fern, Athens County Ohio Carboniferous 9.75″ is in sale since Saturday, July 18, 2020. This item is in the category “Collectibles\Rocks, Fossils & Minerals\Fossils\Vegetation\Petrified Wood”. The seller is “howard_and_sons” and […]