Acta Geographica Sinica ›› 2016, Vol. 71 ›› Issue (5): 864-872.doi: 10.11821/dlxb201605014

• Geomorphology • Previous Articles     Next Articles

The deduction of the age of the fossil Dali Man from the history of the regional geomorphic-sedimentary evolution

Xiaomeng HU(), Shun CAI, Meijun CHEN   

  1. Geography Department, Shanghai Normal University, Shanghai 200234, China
  • Received:2016-03-06 Revised:2016-03-26 Online:2016-05-25 Published:2016-05-25
  • Supported by:
    National Natural Science Foundation of China, No.41371021

Abstract:

Dali Man, an archaic type of early Homo sapiens, is of great significance to the origin of Homo sapiens. However, there still exists a debate about the age of the fossil. There were a series of lacustrine or alluvial terraces in the northeast part of the Weihe Basin and in the Luohe River near the Dali Man site, and the paper adapted loess-paleosol sequence dating method to determine their ages and make clear the history of the regional paleolake regression-transgression evolution. In combination with the characteristics of the geomorphic-sedimentary body which contains the fossil Dali Man, the paper analyzed the regional paleolake regression-transgression stage during which the body formed. In the light of the particle size evidence and pollen one of the geomorphic-sedimentary body, the paper further analyzed the age of the alluvial sediment in which the fossil human skull was discovered. The result shows that there occurred several paleolake regressions and river down-cutting when S14, L9, L6, S2, L2 and L1SS developed or accumulated respectively, and that the sandy-gravel sediment with the fossil was deposited after the paleolake regression at the late stage of the deposition of L6. This lake regression made some of the paleolake bottom emerge subaerially and Luohe River flowed on it to erode the former lacustrine sediment and deposit the alluvial one. Therefore, the deposition of the alluvial sediment is probably synchronous with the formation of S5, with an average age of 0.55 Ma BP. Because of more development of the Dali Man than the Homo erectus pekinensis, the result indicates that the age of the Homo erectus pekinensis is probably more than 0.55 Ma BP.

Key words: Dali Man, Luohe River, Weihe Basin, loess-paleosol sequence dating method