地质和地层年代表（Geological and stratigraphic year representation）.doc

地质和地层年代表（Geological and stratigraphic year representation） Which part of the country do you want? A representative of geological concept, according to the time sequence that sooner or later relative geological time and isotopic geological period value table. There are two ways to calculate the geological age. First, according to the development of the organism and the order of the formation of rocks, the history of the crust is divided into some natural stages of the development of corresponding organisms, that is, the relative geological age. It can be said that the crust stage and development stage, the order of the geological history of natural geological events; according to the content of the radioactive isotope decay product in strata, determined the formation and geological events in geological time, absolute. Geological year can be worked out accordingly. Two, Chinese geologic generation century code starting time (million years) began to appear biological types of Cenozoic quaternary Holocene Qh 0.01 human Qp Qp2 in the late Pleistocene Pleistocene early Pleistocene Qp1 1.64 Neogene Miocene Pliocene N2 5 N1 23.3 modern mammals appeared in the Paleogene Oligocene Eocene E3 37.5 E2 50 Paleocene E1 65 fish - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - K 135 Mesozoic Cretaceous angiosperms, planktonic calcareous algae Jurassic J 208 birds and mammals appeared in Triassic T 2 50 dragon lizard ichthyosaurs appeared - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Late Paleozoic Permian P 290 type gymnosperms appeared in brutism C 362 hole pteridosperm Cordaitean Kennedy D 410 appeared Devonian Crossopterygii Lycopodium Festival fern ferns appear early Paleozoic Silurian Ordovician S 439 psilophyte appeared O 510 Agnatha appear Cambrian -- 570 shell animal - - - - - - - - - - - - - - - - - - - - - - - - - Neoproterozoic Sinian Z 680 has no hard animal nanhuaian Nh 800 Qingbaikouan Qb 1000 senior animal multicellular algae appear the Meso