TRACE FOSSILS FROM THE LOWER TRIASSIC CONDENSED SECTIONS IN THE GUIYANG DISTRICT,GUIZHOU

The Lower Triassic strata in the Guiyang district represent an uninterrupted carbon-ate sequence corresponding to the third-order cyclic sequence.The condensed sections in the carbonate sequence consist of dark alternating laminations (0.5-1 cm thick for individ-ual laminae)of micritic limestones and muddy banded limestones,where abundant trace fossils have been found,including Cochilichnus,Cosmorhaphe,Chondrites,Gordia,Gloderi-a,Huaxichnus,Oldhamia,Phycosiphon,Protopaleodictyon,Pinnatpedus,Mammillichnus, Neonerites and bioturbated structures,These trace fossil assemblages are similar to the Nereites ichnofacies.The author in this paper gives a more detailed explanation of the gene-sis of the above-mentioned ichnocoenoses.