Fossil by geology

 Precambrian

Hadean

Archaean

Proterozoic

Palaeozoic 

Cambrian

Ordovician

Silurian

Devonian

Carboniferous

Permian

Mesozoic 

Triassic 

Jurassic 

Cretaceous

Cenozoic 

Tertiary

Palaeogene

Palaeocene

Eocene

Oligocene

Neogene

Miocene

Pliocene

Quaternary

Pleistocene

Holocene

Coraline , Anatomical and Botanical Classification