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羽状交错层理由倾向相反的两组纹层组成,中间一般不发育隔层,主要形成于滨海(湖)环境。在宁夏香山群第二亚群发现了类似沉积构造,但两组纹层之间却发育有规模较大的隔层。前人研究认为,该套地层主要形成于浊流环境,尽管存在分歧,但较深的水体环境是勿庸置疑的。这与羽状交错层理形成的环境完全不同,故将其命名为类(似)羽状交错层理。目前似乎只有内波沉积理论能够较为圆满地解释深水环境中这种特殊的牵引流沉积现象。
The pinnate interlacing is composed of two sets of lamina with the opposite tendency. The interbeds generally do not develop compartments, and are mainly formed in coastal (lake) environment. A similar sedimentary structure was found in the second sub-group of Xiangshan Group in Ningxia, but there was a large-scale interlayer between the two sets of layers. Previous studies suggest that this formation mainly formed in the turbidity current environment, although there are differences, but the deeper water environment is beyond doubt. It is completely different from the environment formed by the pinnate interlacing, so it is named as quasi-pinnate interlacing. At present, it seems that only the theory of internal wave deposition can satisfactorily explain this particular phenomenon of traction deposition in deep-water environment.