DISCUSSION ON THE NAMING OF QUATERNARY TRANSGRESSIONS IN WEST-SOUTHERN COAST PLAIN OF BOHAI SEA

Based on micropalaeontological information of over 150 drill holes, this paper discusses the problem on the naming of Quaternary transgressions in the west-southern coast plain of Bohai Sea.We consider that palaeotide and sedimentation have a great influence on the distribution of micropalaeontological fossils.In view of the present technical level, it is necessary for transgression sequence to be established under the following conditions:full evidence of fossils; clear climate; and stable sedimentary beds.In establishing a transgression, its contents of time and phase concept must be proposed, and its biofacies, sedimentary facies and palaeoclimatology must be analysed synthetically.