Research Development and Prospects on Paleogene Sea Transgression in Bohai Bay Basin

Abstract

The question whether transgression happened in Paleogene of Bohai Bay Basin has been discussed for more than 20 years, yet it was not resolved. The scholars insisting on transgression provided many markers such as mineralogy, lithology, paleoecology and geochemistry, but these makers are not completely the same as normal makers, moreover, the passageway and obviously increased makers of transgression have not been discovered, so marine flooding, tsunami and terrestrial facies appear, these viewpoints have coexisted for a long time. Penman considers that the question can be solved by 4 ways: ①The structural setting of Bohai Bay Basin should be studied thoroughly to conclude possibility of the transgression's passageway. ②Reliability of makers provided should be newly considered. ③New and exclusive evidences are required. ④Similar sediment traps in correlative strata abroad are collected to research contrastively.