Plant Fossils - St. Clair, Pennsylvania
Llewellyn Formation
Relative and fossil age dating of the Llewellyn places it in the late-Middle to Late Pennsylvanian,
being deposited between 308 and 300 million years ago.
Relative and fossil age dating of the Llewellyn places it in the late-Middle to Late Pennsylvanian,
being deposited between 308 and 300 million years ago.
Donated by Adrien Malick
62-1 Alethopteris - seed-fern
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62-2 Alethopteris - seed-fern
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62-9 Sigillaria - Also known as a "Scale Trees." This is because in the 19th century, due to the reptilian look of the diamond-shaped leaf scar pattern, petrified trunks of Lepidodendron were frequently exhibited at fairgrounds by amateurs as giant fossil lizards or snakes
62-10 Alethopteris
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62-11 Alethopteris
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Alethopteris is among the seed ferns (Pteridospermales), an extinct group of gymnosperms.
62-12 Sigillaria
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62-13 Plant stem - reverse image
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