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.