Alethopteris, Neuropteris, Pecopteris, Sphenophyllum Pennsylvanian Llewellyn Formation, St. Claire, Pennsylvania Dramatic contrast is seen in white ferns on the black shale sediment in which they were fossilized. These plants died and fell into a marsh, 330 million years ago, where a low temperature, low oxygen environment allowed the plant tissue to be slowly replaced by pyrite (from sulphides.) Pyrophyllite (aluminum silicate - a whitish mineral) is believed to have replaced the pyrite at a later stage as the sediments deepened and the temperature and pressure increased. Measures 44 x 28in
Alethopteris, Neuropteris, Pecopteris, Sphenophyllum Pennsylvanian Llewellyn Formation, St. Claire, Pennsylvania Dramatic contrast is seen in white ferns on the black shale sediment in which they were fossilized. These plants died and fell into a marsh, 330 million years ago, where a low temperature, low oxygen environment allowed the plant tissue to be slowly replaced by pyrite (from sulphides.) Pyrophyllite (aluminum silicate - a whitish mineral) is believed to have replaced the pyrite at a later stage as the sediments deepened and the temperature and pressure increased. Measures 44 x 28in
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