Samples from multiple sets of the Jurassic-Neogene conglomerate outcrops in Kuqa depression were collected and analyzed for the composition

flatness

sphericity

and size of gravel

and the sedimentary facies that had made everything happened

and for a semi-quantitative study of transportation distance of gravel in front of southern Tianshan Mountain.The results show a far-to-near pattern of gravel transport distance for the Jurassic-Neogene conglomerate.Gravels in the Lower Jurassic Ahe-Yangxia Formations migrated the farthest to 110-130 km

and those from the Neogene Jidike Formation moved the shortest at only 20 km.Between them

the gravels of the Upper Jurassic Kelaza Formation moved about 40 km

that of the Lower Cretaceous Yageliebu-Bashijiqike Formations ran at a distance range between 20 and 45 km and that in the Palaeogene conglomerate transported from 20 to 50 km.Combined with the previous apatite fission track data

the new results indicate that the uplift of the Tianshan Mountains can be divided into 4 stages(two of them were major unplifting and two of them were minor ones):the Triassic-Early Jurassic

Late Jurassic-Early Cretaceous

Late Cretaceous-Eocene

and Miocene-present.The composition

shape and size of the gravels as well as migration of provenance reflected by the gravel transport distance show that the sedimentary evolution of the conglomerate responded strongly to the 4 stages of uplifting process.