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MESOZOIC SEDIMENTARY ENVIRONMENT AND BIOLOGICAL COMPOSITION IN LUOZHA,SOUTH TIBET

XIA Jun1,WANG Lu-tai2,ZHONG Hua-ming1,TONG Jing-song1,LU Ru-kui1,3(1.Anhui Institute of Geological Survey,Hefei 230001,China;2.No.321 Geological Party of Anhui Province,Tongling 244051,China;3.Northwest China University,Xian 710069,China)  
The article analyzed the biological habits characteristics in Late Triassic-Early Cretaceous stratum of Luozha area,maked a preliminary study for the patterns of biological function,behavior habits,buried fossils,the relationship between the biological and environmental as well as biological each other,divided the 14 major paleontological communtiy adapted to the environment,Late Triassic HST Monotis salinaria-M.haueri communtiy,shelf-type storm debris Entolium nieniexionglaense-Cruziana communtiy,muddy shelf-volcanic Coroniceras communtiy,Early Jurassic TST Melanoides-Discohelix communtiy,Early-Middle Jurassic HST Hastites-Chondrites communtiy,abyssal see condensed section Discinisca-Euestheria communtiy,Late Jurassic mudstone shelf Buchia blanfordiana-Vingatosphinctes-Belemnopsis communtiy,mudstone condensed section Belemnopsis aucklandica communtiy,LST shelf-slope Hibolithes jiabulensis-Belemnopsis sinensis communtiy,open sea-shelf Belemnopsis-lanfardiceras-Haplophylloceras,Himalayites-Spiticeras,Berriasellidae-Inoceramus,Cruralina-Peregrinella communtiy,lagoon-blocking Ancylocaratidae-Bochitidae communtiy,a regional Late Triassic-Early Cretaceous sedimentary-ecostratigraphic framework was established.
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