Two sedimentary complexes developed in the Lower Cambrian at Yangjiaping

Shi-men

Hunan Province.The first is a deep-water association constituted by marine au-tochthonous deposits and gravity flow deposits.The second is a shellow-water association constituted by tractive current deposits and algal stromatlite deposits.According to the se-quence of the section

it is concluded that the Early Cambrian from early to late period underwent the evolution process of deep sea basin→basin margin→platform foreslope→shallow beach→tidal flat

and formed a sedimentary sequence from deep to shallow water.