Cambrian Period

Jere Lipp's on the radiation of the first animals
 

The Burgess Shale Foundation

Dr. Macrae's Burgess Shale page
 

Burgess Shale at the Smithsonian

 
 

Trilobites from Utah
 

Ordovician Period

Ordovician Fossils from New York

Ordovician Paleontology

Dunkleosteus

Cladoselache and other Devonian sharks

Australian Lungfish

 Lobe - Finned Fish

 Acantostega gunneri

Devonian Red Hill site, Pennsylvania

 Devonian Rhynie Chert

Carboniferous Dendrerpeton

Seymouriamorphs

Pelycosaurs

Russian mammal-like reptiles

Gorgonopsid from the Karoo beds of South Africa

 South African mammal-like reptiles

Pennsylvanian Mazon Creek fossils

Peabody Museum collection of Mazon Creek fossils

Lepidodendron and othe Carboniferous plants

Permian Period

Mass extinctions

A mathematical model for mass extinction

Cuffey on the link between reptiles and mammals

Causes of the Permian mass extinction