Fold thrust zones in northern edge of Western Kunlun and in southern edge of Southern Tianshan

with different structural features

are developed in southern and northern Kashi depression

respectively.The fold thrust zone in southern edge of Southern Tianshan is characterized by its S-N zonation and E-W segmentation;deformation in the eastern segment is generally stronger than that in the western segment

and it is also affected by the Talas Ferghana fracture.The fold-thrust zone in northern edge of Western Kunlun is relatively heavily influenced by the Pamir Arc.The ophiolitic melange in the orogenic zone have been involved in the thrust zone where many formations are inverted.Besides

a large Wupoer-Piaoertuokuoyi piggyback basin is developed.Difference between the pre-Mesozoic in the two fold thrust zones is significant

while it decreases progressively upward

indicating that Kashi depression has evolved into a unique sedimentary unit since Mesozoic.The unconformities do not strictly correspond to each other in the two fold thrust zones.The number of unconformities in the fold thrust zone in northern edge of Western Kunlun is larger

and the horizon is lower than that in the southern edge of Southern Tianshan

revealing that the development of the former is a little bit earlier and the thrusting is stronger than that of the latter.