Linxia is a district in Gansu Province,locates in the north-east edge of the Tibetan Plateau.Huge thick of Cenozoic red stratum over last 4~29 Ma was reported there,providing valuable geological record to recognize the Plateau uplifting process and climatic evolution during Cenozoic.Of which deposits,red-gray interbeds with paleomagnetic age of 13.07~7.78Ma are especially very eye-catching.These beds were vividly named as Zebra Layer.These interbed layers are nearly horizontal.Because of the gray layers,whi...