Үлгі:Ordovician Footer

See also

• Template:Eon Footer

• Template:Hadean Footer
• Template:Archean Footer
• Template:Proterozoic Footer
• Template:Phanerozoic Footer

• Template:Paleozoic Footer

• Template:Cambrian Footer
• Template:Ordovician Footer
• Template:Silurian Footer
• Template:Devonian Footer
• Template:Carboniferous Footer
• Template:Permian Footer

• Template:Mesozoic Footer

• Template:Triassic Footer
• Template:Jurassic Footer
• Template:Cretaceous Footer

• Template:Cenozoic Footer

• Template:Paleogene Footer
• Template:Neogene Footer
• Template:Quaternary Footer

Sources

• http://www.stratigraphy.org/cheu.pdf
• http://www.stratigraphy.org/codeu.pdf