A revised heterostracan-based ichthyostratigraphy of the Wood Bay Formation (Lower Devonian, Spitsbergen), and correlation with Russian Arctic archipelagos

Geodiversitas

Alain Blieck¹  Vincent N. Pernègre¹ 

关键词: Old Red Sandstones;    Pragian-Emsian;    Heterostraci;    vertebrates;    Svalbard;    Novaya Zemlya;    Severnaya Zemlya;    Vieux Grès Rouges;    Praguien-Emsien;    Heterostraci;    vertébrés;    Svalbard;    Nouvelle Zemble;    Terre-du-Nord;   

DOI  :  10.5252/g2016n1a1

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

Spitsbergenshowsaseveralkilometersthick,mostlysiliciclasticDevoniansequence.Inthissequence,theWoodBayFormationrepresentsatypicalOldRedSandstonemegafaciesunitofEarlyDevonianage(Pragian-Emsian).ItoutcropsintheAndréeLandBlock(oftenwronglydesignatedasthe“mainDevoniangraben”)inNWSpitsbergen.Itsstratigraphyhasbeenmostlyestablishedintwoareasofthisblock,thatis,intheWoodfjordenareainthenorth,andintheDicksonfjorden-Austfjordenareainthesouth.Arevisionofthepteraspidiformheterostracanvertebrateshasbeencarriedoutinbothareas.Eightdifferentfossilassemblagesaredefined,fivefortheWoodfjordenarea(WA),andthreefortheDicksonfjorden-Austfjordenarea(DAA),thatenablethecorrelationoftheSigurdfjelletandKappKjeldsen“faunaldivisions”ofthelowerWoodBayFormation(inWA)withtheAustfjordenMember(inDAA),andtheKeltiefjellet“faunaldivision”oftheupperWoodBayFormation(inWA)withtheDicksonfjordenMember(inDAA).Unfortunately,pteraspidsdonothelpwithcorrelationbetweentheuppermostpartsoftheWoodBayFormationinthenorthandsouthoftheAndréeLandBlock.Theseresultsareusedalsoforamoreprecisecorrelationwiththeheterostracan-bearing,EarlyDevonian,OldRedSandstoneseriesofNovayaZemlyaandSevernayaZemlyaintheRussianArctic.TheyalsoconfirmthatSpitsbergenandthoseRussianarchipelagoswereelementsoftheEarlyDevonian,palaeobiogeographicArcticProvince.

【 授权许可】

Unknown