Abstract:

Stratigraphically,the Tangwangling Formation,which can be divided into four members,is about 1100.41m in Huangpigou,Liquan County,Shaanxi Province.The sediments are plenty and varied.From shallow to deeper water,there exist in turn:1.light colour carbonate tongue developed in the front margin of platform(79.26m,making up 7.2% of the section thickness);2.continental slope sediments(130.94m,11.9%);3.contour current sedi-ments(7.09m,0.6%);4.mudflow sediments(635.57m,57.8%);5.debris flow sediments(215.32m,19.6%);6.grain-flow sediments(8.01m,0.7%);7.turbidity current sediments(24.22m,2.2%).Continental slope sedimentsappears to be mainly in the first member of the Tangwangling Formation,while the light colour carbonate tongue only found in the second member of the formation.Sediments in the third and fourth member were mainly generated by sediment gravity flows,which were developed in the background of effectiveregression.So it can be seen clearly that these sediments of the Tangwangling Formation were not formed by glacier as were recognised by many people before.