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OCR: Period Epoch Era Eon Holocene Qa Qg |Qs Qbf Qmf Qrb 10.000 Qw Qf Qb Qls Pleistocene Om Qbo Qlk 2 Na Quaternary Pliocene QTg QIs Tps Tpf |Tpo QTb Miocene Tms Tmv ITmi Tmf Tmb Tcr 74 Ne Neogene Ts Cenozoic Oligocene Toi Tov 37 Na Eocene Tes Tev Todd Tgs Tertiary Sa Na Accreted Terrane Paleccene Paleogene 68 NE TKg Units Cretaceous, Ma Ks Kgd Kgdh Kis Kog Ktq KPro KP Mzu Js KJim KJif Jurassic Jiz Jch 208 Na Triassic Rs TAS Rof Rmh 245 Me RPi RPsd Mesozoic Permian Ps PIPS PIPs KPro KP Pennsylvanian Ps PPMS Phanerozoic 330 HE Pzu MzPzb Mississippian Ms Ds MDs Carboniferous Devonian 208 Me DSs Silurian Ss DSOs Paleozoic 438 Na SOS Ordovician Pzl Os 505 Na 0€s PzXm PzY sq PzZm Cambrian Es O€s Neo- CZb (late) Zs Zw Zi Zdt Zp Belt Supergroup Units 1000 Na Ymiu Ymil Y.5M Meso (middle) Ybe Yan Yam Ys Ysq YXm Yag PzYsq Vc Yqw Proterozoic Vra Yara Yh Prephanerozo c Precambrian -600 M Ysp Yy Paleo- (early-) Xm Yp PzXm -1470 Ma 2500 Ne Archean Wm Earth - 4600 Ma Oldest Rock ~3900 Ma