Jere
Lipp's on the radiation of the first animals
Dr.
Macrae's Burgess Shale page
Burgess
Shale at the Smithsonian
Ordovician Fossils from New York
Cladoselache and other Devonian sharks
Devonian Red Hill site, Pennsylvania
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
A mathematical model for mass extinction