raisin c a 1891 on the lower limit of the cambrian series外语英文电子书

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1、QuarterlyJournaloftheGeologicalSocietyOntheLowerLimitoftheCambrianSeriesinN.W.CaernarvonshireCatherineA.RaisinQuarterlyJournaloftheGeologicalSociety1891;v.47;p.329-342doi:10.1144/GSL.JGS.1891.047.01-04.20Emailalertingclickheretoreceivefreeemailalertswhennewservicearticlescitethisa

2、rticlePermissionclickheretoseekpermissiontore-useallorpartofrequestthisarticleSubscribeclickheretosubscribetoQuarterlyJournaloftheGeologicalSocietyortheLyellCollectionNotesDownloadedbyon31May2007©1891GeologicalSocietyofLondonTHECAI~tBRI&NSERIESINN.W.CAER~ARVONSHIRE.32918.OntheLowE

3、RLI~lXoftheCAmBRL~rS~IESinN.W.Cxmucx~vo~-S~rI~E.ByCXTrrE~INEA.RA~sr~,B.Se.(ReadFebruary25,1891.)(CommunicatedbyProf.T.G.B(~.~m',D.Se.,F.R.S.)CONTENTS.PageI.THEB.4,NGORDISTRIC"r................................................32)9(a)LithologicalCharacteroftheStrata..................

4、......329(b)UnconformitybelowtheCambrianConglomerate......330(c)DetailsofOutcrops.............................................331II.ThEAaENIGUNCONFORMITYATCAERNARVONANI)TIlETIIlCK-NESSOFTHECAMBRIANSERI]~S.................................331III.THEAGEOFTHESOUTnEItNFEI,SITE.........

5、........................332(a)LithologicalComparisonoftheSedimentaryStrata...332(b)ValueoftheConglomerateasaBase.....................333(c)PhysicalConditionsoftheCambrianPeriod............334IV.TIIEBRYN-~EFAILSECTIONS.............................................335(a)Stratanorthof

6、theValley....................................335(b)QuarryatBrynEfail.........................................336(c)SectionintheRoadbelowtheCottages..................339I~thecourseofsomeinvestigationofthe"schists"oftheLleyn,itbecamenecessarytocomparethemwiththerocksinneighbouringdi

7、stricts.Iwasthereforeledtomakesomeexaminationofthese,especiallywithreferencetothenewinterpretationwhichhasbeenrecentlyproposed*.InthisMr.BlaketriestoestablishagreatextensionoftheCambrianseries,increasingthelengthofthesuccessionasgenerallyaccepted,andincludinginitthepre-Cambrianbed

8、snearBangorandtheLlyn-Padarnfelsi