supported by the NSFC"Outstanding Young Scholar Program"(Grant No.40025105);by the National Key Basic Research Project(Grant No.G2000048701);the Knowledge Innovation Project of CAS(Grant No.KZCX1-10-01)
Field works show that the wetland/swamp layers were distributed ubiquitously in the western part of the Chinese Loess Plateau. Universality of the wetland/swampy layer and the consistency of the age reveal that the la...