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Identification: Alethopteris sp. Age: Pennsylvanian-Carboniferous Geology: Llewellyn formation Locality: St. Clair, Pennsylvania St. Clair ferns St. Clair, Pennsylvania fern fossils are famous Pennsylvanian-age plant impressions preserved in black shale, often showing bright white outlines from mineral replacement. They commonly include ferns such as Alethopteris, Neuropteris, and Pecopteris. These fossils formed in ancient swampy environments, where plant material was buried, compressed, and mineralized over time.
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🇺🇸 Ship from USA · On Agora since 2025
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