Alethopteris

Description

Fossil Fern "Alethopteris sp." The white coating on these fossils is "pyrophyllite", a mineral like talc which replaced part of the plant material

Potsville fmt. - Pennsylvanian - Late Carboniferous - About 300,000,000 years

St. Claire - Pennsylvania - U.S.A. -

Size: 18x9.5 cm

Thickness: 1.20 cm

Weight: 300 g