陕西宁强地区灯影组高家山段地层中特异原地埋藏的管状化石Gaojiashania Yang et al.,1986为体似蚕状或带状，直或微弯，由密集圆环（或皱脊）彼此连接在一起形成的管状化石，对化石的埋藏及保存特征的研究表明，不同的矿化阶段形成不同的保存特征，早期黄铁矿化对化石保存起着重要作用。Gaojiashania以其特殊的圆环叠置的保存方式，与软躯体蠕形动物化石以及遗迹化石的保存迥然不同，推测Gaojiashania生物体已具有分节现象，在成分上也有差别，圆环部分可能具有一定的矿化，属于较为高等的生物门类。

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

Q915.6

国家杰出青年基金项目 (4 945 2 0 0 2孙卫国 )，国家重点基础研究发展规划项目 (G2 0 0 0 0 7770 0 )，中国科学院资源环境领域知识创新工程重大项目 (KZCX2 116)资助成果