APPROACH ON INFORMATION FUNCTIONS AND CONODONT PALAEOCOLOGY

The strata in the adjacent area of Su-Zhe-Wan (the provinces of Jiangsu, Zhejang, and Anhui) area dated from Changxing period of the late Permian are taken as a rock unit, which, from southeast to northwest of the study area, are successively divided into peri-beach tide-flat fades, shallow water carbonate platform facies, platform-front carbonate depression fades and peri-platform margin siliceous rock facies. The yields of conodonts from the sections of different facies belts are studied, and the data are processed on computer with the method of information functions. It has been found that the yield frequency,differential index,yields,isostatics, the species and forms of conodonts from different facies belts are all closely related to sedimentary facies, paragenetic minerals, water depthes,salinity and hydrodynamic conditions. The synthetical study shows that 1. the environments favourable for the breeding and living of conodont animals are shallow-water carbonate platform facies and platform front depression facies, especially the latter; 2. peri-beach tide flat facies with shallow water body and peri-platform margin siliceous rock basin facies with deeper water body are unfavourable for the living of conodont animals; 3.the extensively distributed monomolecular organs belong to the plankton ecological type of Neogondodella, while the limitedly distributed polymolecular organs belong to the benthic ecological type of Prioniodella, Hibbardella, and Enantiognathus.