Stratigraphia (geologia)
Stratigraphia est stratorum geologicorum studium, e quo evolvuntur definitiones unitarum stratigraphicarum et scala aevorum geologicorum.

Bibliographia 
 Lexique stratigraphique international. Lutetiae: Centre National de la Recherche Scientifique, 1956–1962? Descriptio huius operis
 F. Gradstein, J. Ogg, A. Smith, edd., A Geologic Time Scale 2004. Cantabrigiae: Cambridge University Press, 2004  Textus
 Gilles Serge Odin, Silvia Gardin, Francis Robaszynski, Jacques Thierry, "Stage boundaries, global stratigraphy, and the time scale: towards a simplification" in Carnets de Geologie (2004) pp. 1-12
 Pierre Rat, "Regards sur deux siècles de stratigraphie" in Travaux du Comité Français d'Histoire de la Géologie 3a ser. vol. 20 (2006) n° 6
 A. Salvador, ed., International Stratigraphic Guide. A guide to stratigraphic classification, terminology and procedure. 2a ed. Trondheim: International Union of Geological Sciences, 1994
 J. D. Walker, J. W. Geissman, S. A. Bowring, L. E. Babcock, "The Geological Society of America Geologic Time Scale" in GSA Bulletin vol. 125 (2013) pp. 259–272

Nexus externi 
 International Commission on Stratigraphy 
 '"International Chronostratigraphic Chart" variis linguis edita
 Stratigraphy.net
 "Stratigraphic units" apud Fossilworks

 Indices stratigraphici nationales
 Australia : Australian Stratigraphic Units Database
 Austria : Geological Survey of Austria
 Britannia et Hibernia : British Geological Survey
 Canada : WebLex Canada
 Lexique stratigraphique du Québec
 Civitates Foederatae : National Geologic Map Database
 Germania : LithoLex
 Helvetia : Lithostratigraphic Lexicon of Switzerland; de hoc lexico
 Mexicum : Léxico estratigráfico de México
 Norvegia et Europa boreoccidentalis : Lithostratigraphic Units of North-West Europe
 Nova Zelandia : New Zealand Stratigraphic Lexicon

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Chronologia