时间年代表的理解_精品文档Word格式文档下载.docx

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Isformedinaccordancewiththerelativegeologicaltimeandrocksequenceofbiologicaldevelopment,thehistoryoftheEarth'

scrustisdividedintoacorrespondingnumberofnaturalstagesofbiologicaldevelopment.Absolutegeologicaltimeisbasedontheformationofradioisotopedecayproductsofcontent,measuredsubterraneanformationsandgeologicalageofevents.

GeologictimescalehasGeologicaltimeunitswithdifferentlevels,oneofthelargestgeologicaltimeunitis"

Eon"

thesecondaunitis"

Era"

thethirdstageunitis"

Period"

fourthlevelunitsas"

Epoch"

.

TheEonisdividedintoArchaeozoicEon,ProterozoicEonandPhanerozoicEon.ArchaeozoicEonistheoldestgeologicalera,onlyprimitivebacteriaandalgaeorganisms.ProterozoicEon‘sbiologicalmainlybacteriaandalgae,italsocanincludingSinianPeriod.PhanerozoicEonisthebeginningofalargenumberofotheranimalssincethehigherstage,includingthePaleozoicEra,MesozoicEraandCenozoic.PaleozoicErameans"

ancientcreature"

era,markingthelargenumberofbiologicaldevelopment.PaleozoicEraalsoincludestheCambrianPeriod,OrdovicianPeriod,SilurianPeriod,DevonianPeriod,CarboniferousPeriod,PermianPeriod;

MesozoicEraincludesTriassicPeriod,JurassicPeriod,CretaceousPeriod;

TertiaryPeriodandQuaternaryPeriodincludedbyCenozoic.

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