6.65" Fossil Lycopod Tree Root (Stigmaria) Plate - Pennsylvania

This is a 6.65" wide plate of shale features a fossilized Lycopod tree (Lepidodendron sp.?) root section (Stigmaria) from the Pennsylvanian aged (305 million year) Llewellyn formation of Pennsylvania. These St. Clair fossil flora plates used to be quite common but access to the locality is now restricted so there is not a lot of material left on the market.

Comes with an acrylic display stand.

These plants were buried in a swamp where a low temperature, low pressure, and low oxygen environment caused the plant tissue to be 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.