Calymmian - (Proterozoic: IV. Mesoproterozoic) ,Statherian ,Orosirian ,Rhyacian ,Siderian - (Proterozoic: III. Palaeoproterozoic) ,Neoarchaean - (II. Archaean) ,Mesoarchaean - (II. Archaean) ,Palaeoarchaean - (II. Archaean) ,Eoarchaean - (II. Archaean) ,Hadean - (I. Hadean) ,Ectasian - (Proterozoic: IV. Mesoproterozoic) ,Stenian - (Proterozoic: IV. Mesoproterozoic) ,Tonian - (Proterozoic: V. Neoproterozoic) ,Cryogenian