时间年代表的理解_精品文档.docx

时间年代表的理解_精品文档.docx

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Talkaboutyourunderstandingaboutgeologictimescale

Geologicalageoftheearthisusedtodescribetheunitoftimehistoricalevents,geologictimescaleshowingrelativeageandisotopicagevaluesaccordingtothehistoryoftheperioderachronologicalorder.Reflectsthecrustofinorganicandorganicsectorcalculatedaccordingtodifferentgeologicalage,geologicaltimecanbedividedintorelativeGeologicaltimeandabsolutegeologicaltime.

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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