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St. Clair, Pennsylvania

Llewellyn Formation 300 Ma - Pennsylvanian Period The plants died and fell into a swampy environment, where in the low temperature, pressure, and oxygen rich climate, the plant tissue was slowly replaced by pyrite (from sulphides). Pyrophyllite (aluminum silicate, a white colored mineral) is believed to have replaced the pyrite at a later stage as the sediments piled up and the temperature and pressure became greater. The ferns most commonly found are Alethopteris, Neuropteris, Pecopteris, and Sphenophyllum.

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  1. Fossil Seed Fern from the Carboniferous Period Pennsylvania
    $30.00
    Llewellyn Formation 300 Ma - Pennsylvanian Period St. Clair, Pennsylvania, USA Slab : 21 x 14.5 cm (1 inch = 2.54 cm) Learn More
  2. Seed Fern Branch Tips Multiple Leaf Fossils from Pennsylvania USA
    $95.00
    Llewellyn Formation 300 Ma - Pennsylvanian Period St. Clair, Pennsylvania, USA Slab : 35 x 26.5 cm (1 inch = 2.54 cm) Learn More
  3. Seed Fern Branch with Multiple Leaf Fossils from Pennsylvania USA
    $110.00
    Llewellyn Formation 300 Ma - Pennsylvanian Period St. Clair, Pennsylvania, USA Slab : 30.5 x 25.5 cm (1 inch = 2.54 cm) Learn More

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