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Lot 1001
Large Fern Plaque
27 May 2010, 13:00 EDT
New YorkSold for US$5,185 inc. premium
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Find your local specialistLarge Fern Plaque
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 30 x 35in
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 30 x 35in

