Archive > 2002(3):448-454. DOI:1 Prev Next

PRESERVATION AND MORPHOLOGIC INTERPRETATION OF LATE SINIAN GAOJIASHANIA FROM SOUTHERN SHAANXI

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    Abstract:
    OneofthemostabundantfossilsofGaojiashanBiota,GaojiashaniaYangetal.,1986,wasoriginallydescribedbyLinandZhang(1986)fromtheGaojiashanMember,DengyingFormaitonintheGaojiashansection,NingqiangCounty,southernShaanxi.Theyareburiedinsitu,occurringinthesiltstoneandlimestone.Gaojiashaniaisastraightorcurvedtubelikefossilcomposedofaseriesofridgesandrings.MostofGaojiashaniaarethreedimensionallypreservedandsomespecimensarepreservedasmembraneslyingonthesurface.Thedifferentappearanceandcharacterareassumedtoberesultedfromthediageneticprocessandmineralization.Earlydiageneticpyriteplayedanimportantroleinthepreservationofthefossils.Thesoftbodiesofthefossilscanbepreserved,thissuggeststhatthepyritemineralizationoccurredveryearlyinthediagenetichistoryofafossilandpriortoappreciabledecayofsoftbodiesofthefossils.Exceptionalpreservationisduetorapidmineralizationpriortodecay.Gaojiashaniawasfirstdescribedaswormandreferredtoannelids.Thespecimensareoftenthreedimensionallypreservedandcomposedofaseriesofseparateringslinedonthesubstrate.Thesefeatureshavenotbeenknownfromanykindofwormsandtracefossils.TheGaojiashaniaappearsmetamericandtheringsasthehardpartsofthebodyseemtohavebeenbiomineralized,perhapshadnorelationshipwiththeannelids.

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    Project Supported:
    Clc Number:
    Q915.6



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