Graptolites

Photographed by Michael A. Klimetz

Didymograptus

Ordovician

AUSTRALIA

Photographed by Michael A. Klimetz

Tetragraptus

Ordovician

AUSTRALIA

Photographed by Michael A. Klimetz

Phyllograptus

Ordovician

NORWAY

Photographed by Michael P. Klimetz

Dictyonema scalariforme

Silurian

OHIO

Photographed by Michael P. Klimetz

Dictyonema scalariforme

Silurian

OHIO

Photographed by Michael P. Klimetz

Leptograptus flaccidus

Ordovician-Trentonian

Viola Limestone

Murray County

OKLAHOMA

Interpretation

Photographed by Michael P. Klimetz

Didymograptus protobifidus

Ordovician

Bendigo

Victoria

AUSTRALIA