摘要：

文中描述的遗迹化石是河北区调队1/25万萨噶幅(2001年)和中国地质大学1/25万江孜幅、亚东幅（2002年）野外地质调查过程分别的。遗迹化石的产地和时代是：萨噶和吉隆附近的晚白垩世，冈底斯弧前盆地日喀则群昂仁组复理石（化石点1）；和产自康马地区马拉雅拉轨岗日带晚三叠世捏如组，早中侏罗世田巴群，早白垩世加不拉组和晚白垩世宗卓组复理石(化石点2)，少量标本产自北喜拉南带岗巴?定日晚白垩世岗巴村口组(化石点3)。文内共计描述上述地区中生代遗迹化石12个遗迹属，14个遗迹种包含4个未定遗迹种其中多数(5个遗迹属，7个遗迹种)为首次在中被发现和描述(包含有两个新遗迹种)。本文详细研究了各遗迹属的行为习性特征，其中数（有9个遗迹属）过去经常产于世界各地中新生代深海复理石内，根据不同的埋和保存环境它们又可分为两大类，第一类为浊流形后（Post-turbidite）形成的遗迹，它们都是深海食沉积物动物的觅食（Fodinichnia）和游动的牧食迹（Pascichnia）如Gyrophyllites，Phymatoderma，Helminthoida和Phycosiphon，它们的主要特是都具有主动回填构造（active backfill）；另一类为流形成前（Pre-turbidite）形成的雕画迹，它们的主要特征是生活时期形成复的多孔的水道系统，并在其中培养细菌形成园艺式(Gardening)觅食或称为耕作迹（Agrichnia）Megagrapton,Rhabdoglyphus,Helicorhaphe,其中还包括适应低氧环境的化学共（Chemosymbiosis）类型如Chondrites和Cladichnus。在描述的遗迹中还包括住兼觅食(Dwellingandfeedingstructures):Schaubcylindrichnus和Syringomorpha以及一种经常趋向水流的停栖迹(Cubichnia)Sagittichnus。深海相中生代复理石地层（尤其晚三叠世，侏罗白垩纪），在我国除西藏地区特别发育外，内地其他各省区很少发育，因此上述中代遗迹化石资料显得特别珍贵，研它们相信会对今后西藏的地层学，沉积学和岩相古地理学研究，提供有价值的地质资料。

Abstract:

This paper describes Mesozoic trace fossils collected by the Hebei Geological Survey during mapping of the Sage region in 2001 and by China University of Geosciences during mapping of Jiangzi and Yadong regions in 2002.These trace fossils occurred in the following locations and geological ages:Fossil site 1:Late Cretaceous rocks in Sage and Jilong,fore-arc basins in Gangdisi and flyschdepositsintheAngrenFormationShigatseGroup.Fossilsite2:LateTriassicNiejeiFormationinLaguigangri,Kangmaregion,northernHimalayas;EarlyMiddleJurassicTianbaGroup,Early Cretaceous Jiabula Formation, and Late Cretaceous Zongzhue Formation flysch deposits.Fossil site 3: (small amount) Late Cretaceous Gangbacunkou Formation in the southern part of northern Himalayas.12 ichnogenera and 14 inchnospecies are described.Mostofthesetracefossils5inchnogeneraand7inchnospecieshaveneverbeenreportedinChinapreviously includingtwonewinchnospeciesEthologicalcharacteristicsofthesetracefossils,including9commonMesozoicandCenozoicichnogenera,thatoccurredinflyschdeposits around the world, were analyzed. According to their taphonomic environment andpreservationalstyle,thesetracefossilscan be divided into two categories:thefirsttypeisknownaspost-turbiditetraceswhicharepredominatedbyfeedingandgrazingtrails in the deep sea,forexample,Gyrophyllites,Phymatoderma,HelminthoidaandPhycosiphon.Thesetracesarecharacterizedbyactivebackfills.Thisgroupalsoincludesanimalswithchemosymbiosisthathasadoptedlowsoxygenconditions,suchaschondritesandcladichnus.Thesecondtypeispre-turbiditegraphoglyptidawhicharecharacterizedbycomplextunnelingsystemthatwasfilmedbybacteriaandgardening(Agrichnia).RepresentativesofthistypeareMegagrapton,Rhabdoglyphus,andHelicorhaphe.ThesedescribedtracefossilsalsoincludedwellingandfeddingstructuressuchasSchaubcylindrichnus,Syringgomorpha, and Cubichnia that are aligned with water currents such as Sagittichnus.Except for Tibet,Mesozoicdeepseaflychstrata(especiallyLateTrassicandJurassicCretaceousrocksarerarelydevelopedinotherpartsofChina.Thus,thesetracefossilsprovideuniquevaluablematerialtowardbetterunderstandingofsedimentology,stratigraphy, and paleogeography in Tibet.