Geological units
Darriwilian (Ordovician / Middle Ordovician )
Drumian (Cambrian / Cambrian Series 3 )
Ectasian (Proterozoic / Mesoproterozoic )
Ediacaran (Proterozoic / Neoproterozoic )
Eifelian (Devonian / Middle Devonian )
Emsian (Devonian / Lower Devonian )
Eoarchean (Archaean )
Eocene (Paleogene )
Famennian (Devonian / Upper Devonian )
Floian (Ordovician / Lower Ordovician )
Fortunian (Cambrian / Terreneuvian )
Frasnian (Devonian / Upper Devonian )
Furongian (Cambrian )
Gelasian (Quarternary / Pleistocene )
Givetian (Devonian / Middle Devonian )
Gorstian (Silurian / Ludlow )
Guadalupian (Permian )
Guzhangian (Cambrian / Cambrian Series 3 )
Gzhelian (Carboniferous / Pennsylvanian )