Alethopteris fern

Description

Fossil fern "Alethopteris grandini". The white coating seen on these fossils is "pyrophyllite," a talc-like mineral that has replaced some of the plant matter

Potsville fmt. - Pennsylvanian - Upper Carboniferous - about 300,000,000 years

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

Size 22x15cm

Thickness 0.80cm

Weight 440g