THE ROLE OF TRACE FOSSILS IN DETECTING THE PALEOGENE ESTUARY ENVIRONMENT AND INCISED VALLEY OF DONGPU DEPRESSION, EAST CHINA
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Abstract:
Paleogene deposits in Bohai Basin have long been considered of terrestrial origin and the reservoir depositional environments have thus been treated as fluvial and lacustrine related facies. However, evidence of marginal marine trace fossils from Dongpu Depression, the southmost of the Bohai rifted basin, shows that marine water incursion might have happened several times and a Paleogene seaway might have been existed correspondingly during the highstand periods; in lowstand periods, the original very shallow marine sedimentary setting became lakes in the structurally low area and eroded rivers scattered in palaeovalley districts which have developed from incised drainage. Trace fossil records in fresh water, salt water and marine water deposits related to an estuarine environment are found for the first time in this region. The importance of ichnological records associated with sedimentary evidences are strongly emphasized here in terms of prospecting a seaway related new type reservoir.
