eon/eonothem
Gradstein 1: Eons [Gradstein et al. 2004]
era/erathem
Gradstein 2: Eras [Gradstein et al. 2004]
period/system
Gradstein 3: Periods [Gradstein et al. 2004]
Harland 1: Eras [Harland et al. 1990]
Harland 2: Periods [Harland et al. 1990]
subperiod/system
Gradstein 4: Carboniferous Subperiods [Gradstein et al. 2004]
Harland 3: Subperiods (Carboniferous) [Harland et al. 1990]
Harland 3: Subperiods (Cenozoic) [Harland et al. 1990]
Harland 3: Subperiods (Ordovician) [Harland et al. 1990]
epoch/series
Erwin and Bowring Cambrian Epochs [Erwin and Bowring 2004]
Gradstein 5: Epochs [Gradstein et al. 2004]
Gradstein Cambrian Epochs of Harland [Gradstein et al. 2004]
Harland 4: Epochs [Harland et al. 1990]
Subcommission on Carboniferous Stratigraphy Global Series [Heckel and Clayton 2006]
Webby 1998 Global Series [Webby 1998]
subepoch/series
Gradstein 6: Cenozoic Subepochs [Gradstein et al. 2004]
Harland 5: Subepochs [Harland et al. 1990]
age/stage
Berggren et al. 1995 Cenozoic Stages [Berggren et al. 1995]
Bergström et al. Ordovician Stages [Bergström et al. 2006]
Bergström et al. Ordovician Stages of Gradstein [Bergström et al. 2006]
Budd Cambrian of Siberia [Budd 2003]
Devonian Stages [Kaufmann 2006]
Gradstein 7: Stages [Gradstein et al. 2004]
Gradstein Cambrian of Siberia [Gradstein et al. 2004]
Gradstein et al. 1995 Mesozoic Stages [Gradstein et al. 1995]
Harland 6: Stages [Harland et al. 1990]
Harland Carboniferous of North West Europe (Subages) [Harland et al. 1990]
Harland Devonian of Czechoslovakia [Harland et al. 1990]
Harland Stages (Vendian - Cambrian) [Harland et al. 1990]
Jin Permian Stages [Jin et al. 1997]
Palfy Jurassic Stages [Palfy et al. 2000]
Roscher and Schneider Stages [Roscher and Schneider 2006]
Subcommission on Carboniferous Stratigraphy Global Stages [Heckel and Clayton 2006]
Webby 1998 Global Stages [Webby 1998]
Webby et al. Ordovician Stages [Webby et al. 2004]
subage/stage
Gradstein et al. 1995 Mesozoic Substages [Gradstein et al. 1995]
Harland Cambrian Substages [Harland et al. 1990]
Palfy Bajocian Substages [Palfy et al. 2000]
Palfy Callovian Substages [Palfy et al. 2000]
Palfy Sinemurian - Toarcian Substages [Palfy et al. 2000]
