地质基础知识回顾2-地质年代.ppt

地质年代,Geologic Time,地质年代表,利用化石进行地层对比,Australopithecus afarensis,Australopithecus afarensis“Lucy”,Australopithecus afarensis,Australopithecus afarensis,Homo erectus:1.8 Ma-old,由 Australopithecus(最老的残余种属的年龄约 2.5 Ma)到原始人类之间无截然转变,Principles of Relative Age Dating,Principle of Original Horizontality Principle of Lateral Continuity Principle of Superposition Principle of Inclusions,Principle of Unconformities-disconformity-angular unconformity-non-conformity,Principle of Cross-Cutting Relationships,Principle of Original Horizontality,角度不整合,角度不整合的形成过程,非整合,Nonconformity in the Grand Canyon,Tapeats Sandstone(550 million years old),Vishnu Schist(1700 million years old),Principle of Cross-Cutting Relationships,