Sphenophillum fern

Description

Fossil fern "Sphenophillum oblongifolium" with fragments of "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 19x16cm

Thickness 1.50cm

Weight 630g