一、地层stratigraphy宇eonothem界erathem系system统series阶stage群group组formation段member显生宇PhaneozoicEonothem元古宇ProterozoicEonothem太古宇ArchaeanEonothem新生界CenozoicErathem第四系QuaternarySystem全新统HoloceneSeries更新统PleistoceneSeries第三系TertiarySystem晚第三系NeogeneSystem上新统PlioceneSeries中新统MioceneSeries早第三系PaleogeneSystem渐新统OligoceneSeries始新统EoceneSeries古新统PaleoceneSeries中生界MesozoicErathem白垩系CretaceousSystem侏罗系JurassicSystem三叠系triassicSystem古生界PaleozoicErathem二叠系PermianSystem石炭系CarboniferousSystem泥盆系DevonianSystem志留系SilurianSystem奥陶系OrdovicianSystem寒武系CambrianSystem新元古界NeoproterozoicErathem震旦系SinianSystem中元古界MesoproterozoicErathem古元古界PalaeoproterozoicErathem地层对比stratigraphiccorrelation层位horizon标志层keybed哑层barrenbed缺失lacuna尖灭featheredge透镜状结构lensoid连续continuity不连续discontinuity整合conformity不整合unconformity角度不整合angularun