2到Sinn,震且纪 542 伊迪卡拉纪+ Ediacaran Neo- Mesozoic Era(3.9%) Cenozoic Era(1, 4%) proterozoIc Cryogenian 85 Tonia Paleozoic Era(6.5%) 10 Eon Stenian Meso- 1200 Ectasia proterozoic 1400 Calymmian Hadean 1600 Statherian (13%) 二E 1800 Paleo. Rosarian 19 proterozoic[Rhyacian 2300 Siderian 18 2500 Neoarchean 17 Proterozoic Eon EC A Archean Eon (425%) 2800 meSoarchean 3200 Paleoarchean 12 3600 Eoarchean Lower imit is FIGURE 8.2 Geologic time represented on a 24-hour clock. no defined2004年 Precambrian time includes more than 21 hours on this clock or more than 88% of all geologic time.Sinian, Z, 震旦纪 2004年 伊迪卡拉纪