The degree of amino acid racemization and ages of dozens of fossils teeth in deposit ofsome caves distributing in Zhaoqing

Yunfu

Fengkai

Yangchun in west Guangdong provincewere analyzed in this paper.The ages of these fossils were dated to be 2000～20000a BP

whichsuggests that they deposited from late stage of late Holocene to late stage of late Pleistocene. Onthe basis of these data

it was found that not only the fossils of the same period

but also the fos-sils of different periods were deposited in the identical layer in some caves.Therefore

it was in-ferred that the cave deposit may have undergone reformation and transpOrtation once again beforedepositing in the cave

which made fossils of various periods mix up in the same layer.This paperprovides some new evidences and a new method for studying more details on the evolution ofQuaternary mammal and on the paleoenvironment and paleoclimate。