Stage characteristics for the development of late Quaternary paleosols in the Yangtze Delta area

摘要

The late Quaternary paleosols in the Yangtze Delta area developed in the period of 25 000-12 000 aBP. Phytolith raios(value A)of contents of fan, square and rectangle types indi- cating the warm and humid climate to those of bar, hat and point types indicating cold and dry ci- mates decrease upwards overall on profiles of the paleosols, suggesting that the climates turned from warm and humid to cold and dry. So, the paleosols developed mainly during the regression before the last glacial maximum.