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American Museum of Natural History.
Fossil Seed Fern Plate With Glass Display Case
This Fossil Seed Fern Plate is the perfect addition to your home or office.
About Fossil See Fern Plates: The white color of these detailed fern fossils contrasts well against the black shale they are preserved in. These plants were buried in a swamp where a low temperature, pressure, and oxygen environment the plant tissue was slowly replaced by pyrite. This pyrite was later replaced by a whitish mineral (aluminum silicate) as the fossils were buried and exposed to the heat and pressure inside of the earth.