Fern Alethopteris

Description

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

matter Potsville fmt. - Pennsylvanian - Late Carboniferous - about 300,000,000 years 

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

Size 20x11 cm

Thickness 1,20 cm

Weight 380 g