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《newell n.d. & alii 1985 note on microfabric in upper paleozoic scallops.外语英文电子书》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、AMERICANMUSEUMNovitatesPUBLISHEDBYTHEAMERICANMUSEUMOFNATURALHISTORYCENTRALPARKWESTAT79THSTREET,NEWYORK,N.Y.10024Number2816,pp.1-6,figs.1-14April12,1985NotesonMicro-FabricinUpperPaleozoicScallopsNORMAND.NEWELL'ANDDONALDW.BOYD2ABSTRACTMicrostructureoftheoutershelllayerofuppermorphologi
2、ccharactersavailablefortaxonomicPaleozoicpectinoidbivalvesusually,butnotal-andphylogeneticstudies.Theprogressnotegivenways,isstrikinglydifferentinrightandleftvalves,hereisoneaspectofanongoingcomprehensiveandthedifferencescharacterizegroupsatthege-taxonomicsurveyofPermianandLowerTrias
3、sicnericandfamiliallevels,servingtoaugmentsparsePectinacea.INTRODUCTIONAspartofacomprehensivetaxonomicsur-nomiccharactersunderthebestconditionsveyandrevisionofPermo-Triassicscallopsofpreservation.Soinclusionofdataondis-(Pectinacea)wepresenthereapreliminarytinctiveshellfabricsfacilita
4、tesdiscrimina-noteonthemicroscopicshell-fabricincom-tionofotherwisesimilarcategories.parisonwithananalogouslivingscallop.TheThemicroscopicelementsofmolluscanfieldworkwassupportedinpartbyagrantshellsarecomposedofcalciumcarbonateen-fromtheNationalGeographicSociety.casedinamatrixofprote
5、inaceousmaterial-Morethanahalfcenturyhaselapsedsinceconchiolin.Sincethese,boththecarbonatetheDanishpetrographer,0.B.Boggild,andtheconchiolin,arechemicallyunstable,showedmalacologiststheimportanceofshellthefossilshellsusuallyhavesufferedpro-microstructureintheirtaxonomicstudiesgressiv
6、edestructionofbiologicaldetailswith(B0ggild,1930).Hisseminalworkhasbeenincreasinggeologicage.Theconchiolinma-refinedbymanyinvestigators(seeCarter,trixorthearagonitemaydisappearfirst,and1980a,forcitations).Butthisfieldofinves-thischangecommonlyisfollowedbyrecrys-tigationhaslagged,andv
7、erymuchremainstallizationofthecalciteordissolutionofalltobedoneonthetaxonomic,environmental,thecalciumcarbonate.Anyoralltheoriginalandstratigraphicaldistributionsofthemi-substancesmaybereplacedbysecondarycroscopicelements.minerals,withorwithoutpreservingvestigesFossilbivalvesdisplayr
8、elativelyfew
