Alethopteris, Neuropteris, Pecopteris, Sphenophyllum Pennsylvanian Llewellyn Formation, St. Claire, Pennsylvania 330 million years ago, these plants died and fell into a marsh, 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. This marvelously aesthetic slab displays white ferns which contrast beautifully with the black shale sediment in which they were entombed. Measures 44 x 28in
Alethopteris, Neuropteris, Pecopteris, Sphenophyllum Pennsylvanian Llewellyn Formation, St. Claire, Pennsylvania 330 million years ago, these plants died and fell into a marsh, 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. This marvelously aesthetic slab displays white ferns which contrast beautifully with the black shale sediment in which they were entombed. Measures 44 x 28in
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