Baini formation

age of middle pleistocens

have been discovered recently in the northpart of the Zhujiang Delta. Its origin

age and paleoenvironmental signijicance lead to many con-troversies.However

on research on systematic sedimentological analysis had been done for thesedeposits.The authors

after a series of observations in the fields and analysis in laboratory

pte-liminarily affirm:①Baini Formation lays on the second-order rock-bed river terrace

and pos-sess a duality layer structure of fluvial sediments.②The granulometric

morphometric

andquartz surface features of the clasts show that the deposition took place in the fluvial environmentof which the hydrological ch a racters are different from the recent river system of the ZhujiangDeIta。③The pollen and clay mineral characteristics show that the deposit can not represent anevent of marine transRression

④Although the depositing age may be considered as Middle pleis-tocene

the accuracy of the TL dating data in some profiles needs further study.