Unconformities – Physical Geology Laboratory - VIVA Open ...
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An unconformity is a buried erosional or non-depositional surface separating two rock layers or strata of different ages, indicating that sediment ... Skiptocontent An unconformity isaburied erosional ornon-depositionalsurfaceseparatingtwo rocklayersorstrata ofdifferentages,indicatingthat sediment depositionwasnotcontinuous.Ingeneral,theolderlayerwasexposedtoerosionforanintervaloftimebeforedepositionoftheyoungerlayer,butthetermisusedtodescribeanybreakinthe sedimentary geologicrecord. Therocksaboveanunconformityareyoungerthantherocksbeneath.Anunconformityrepresentstimeduringwhichnosedimentswerepreservedinaregion.Thelocalrecordforthattimeintervalismissingandgeologistsmustuseothercluestodiscoverthatpartofthegeologichistoryofthatarea.Theintervalofgeologictimenotrepresentediscalledahiatus. Unconformitiesareoftenshownaswavyirregularerodedsurfacesingeologictimediagrams. Disconformity Adisconformityisanunconformitybetweenparallellayersofsedimentaryrockswhichrepresentsaperiodoferosionornon-deposition. Byדקי–Ownwork,CCBY-SA3.0,Link Nonconformity Anonconformityisanunconformitybetweenanolderigneousormetamorphicrockandyoungersedimentaryrocklayers. Byדקי–Ownwork,CCBY-SA3.0,Link AngularUnconformity Anangularunconformityisanunconformitybetweenoldertiltedlayersofsedimentaryrock(TiltedBedsandStrikeandDip)andyoungerhorizontalsedimentaryrockbeds. Byדקי–Ownwork,CCBY-SA3.0,Link Testyourunderstanding Figure0.Woudloper/CCBY-SA(https://creativecommons.org/licenses/by-sa/1.0). References Textmodifiedfromhttps://en.wikipedia.org/wiki/UnconformityCC-BY-SA. Previous/nextnavigation Previous:PrinciplesofRelativeDating Next:WorkedExample:RelativeGeologicTime Backtotop License PhysicalGeologyLaboratorybyElizabethJohnsonislicensedunderaCreativeCommonsAttribution-ShareAlike4.0InternationalLicense,exceptwhereotherwisenoted. ShareThisBook ShareonTwitter
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