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Seed Fern Branch Tips Multiple Leaf Fossils from Pennsylvania USA

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Seed Fern Branch Tips Multiple Leaf Fossils from Pennsylvania USA
$95.00

Availability: Out of stock

Llewellyn Formation
300 Ma - Pennsylvanian Period

St. Clair, Pennsylvania, USA

Slab : 35 x 26.5 cm
(1 inch = 2.54 cm)
Description

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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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