ectasij Mesoproterozoic Era Ectas Ectas Ectas Ectasiano ectasi ectasiano Ektas Base of Ectasian a2.1.2.2 延展纪 Geologic Time Scale (2019) ectasium Ectasium エクタシアン紀 Ektasium Ektasis ektazium Ектаз younger bound -1200 Ma Ectasiën Ectasien Ectasien Ectasiense Ectasian Period older bound -1400 Ma Proterozoic Eon Ectasian Calymmian Period Precambrian Supereon Stenian Period Base of Stenian