Alethopteris
Photographed by Michael A. Klimetz
[Frond Impression in Siltstone]

Pennsylvanian

PENNSYLVANIA
Photographed by Michael A. Klimetz
Alethoperis serlii

[Frond Impressions in Shale]

Pennsylvanian

St. Clair
PENNSYLVANIA
Alethoperis decurrens

[Frond Impression in Siltstone]

Carboniferous-Westphalian

Upper Silesia
POLAND
Photographed by Michael A. Klimetz
Photographed by Michael P. Klimetz

Alethoperis serlii

[Pyrophyllitized Frond Impressions in Shale]

Pennsylvanian

St. Clair
PENNSYLVANIA
Photographed by Michael P. Klimetz

Alethoperis serlii

[Pyrophyllitized Frond Impressions in Shale]

Pennsylvanian

St. Clair
PENNSYLVANIA
Photographed by Michael P. Klimetz

Alethoperis grandini

Stranger Formation - Tonganoxie Sandstone Member
Pennsylvanian - Virgilian

Franklin County
KANSAS
Photographed by Michael P. Klimetz

Alethoperis grandini

Stranger Formation - Tonganoxie Sandstone Member
Pennsylvanian - Virgilian

Franklin County
KANSAS
Photographed by Michael P. Klimetz

Alethoperis grandini

Stranger Formation - Tonganoxie Sandstone Member
Pennsylvanian - Virgilian

Franklin County
KANSAS
Photographed by Michael P. Klimetz

Alethoperis grandini

Stranger Formation - Tonganoxie Sandstone Member
Pennsylvanian - Virgilian

Franklin County
KANSAS
Photographed by Michael P. Klimetz

Alethoperis grandini

Stranger Formation - Tonganoxie Sandstone Member
Pennsylvanian - Virgilian

Franklin County
KANSAS
Photographed by Michael P. Klimetz

Alethoperis longchitica

[Pyrophyllitized Frond Impressions in Shale]

Llewellyn Formation
Pennsylvanian

St. Claire

Schuylkill County
PENNSYLVANIA