宁夏石嘴山石炭系纳缪尔期的砂泥岩互层中赋存有低分异度的遗迹化石群落，但这套岩系中的砂岩层和泥岩层各具有不同的遗迹种。ＰｌａｎｏｌｉｔｅｓｍｏｎｔａｎｕｓＲｉｃｈｔｅｒ仅限于保存在砂岩的下层面，形成表生迹；它们的造迹生物是泥质沉积物中潜穴生存的、营沉积摄食方式的蠕虫类。仅限于砂岩上层面的遗迹化石是Ｍｏｎｏｃｒａｔｅｒｉｏｎｎｉｎｇｘｉａｅｎｓｉｓ（ｎ．ｉｃｈｏｓｐ．），系本文新建立的一个遗迹种，均为底生迹。其造迹生物是营悬浮滤食方式的蠕虫类。导致这两种遗迹化石交替出现的因素是半咸水条件和沉积物粒度的变化。这两类造迹生物都属于在高环境压力下所形成的爆发性繁衍的机会种群，并由此指示着具有最低生物分异度的、其含盐度在０５％～０９％的中盐度域的沉积环境，同时也表明这一时期古气候潮湿温暖并伴之以周期性的大量降水 There is a low-grade trace fossil community in the sand-mudstone interbedded with Carboniferous Nanmuir Period in Shizuishan, Ningxia. However, the sandstone and mudstone layers in this series have different relics. PlanolitesmontanusRichter is confined to the lower surface of the sandstone to form the epigenetic trace; their creatures are the living species of sediment in the sediment, sediment feeding habits of the worm. Monocraterionningxiaensis (n.ichosp.), A monumental fossil that is restricted to the upper sandstone, is a newly established monumental species of the present study, all of which are of the primordial origin. Its creatures are camphor worms that are suspended in the form of filtration. The factors that led to the alternating appearance of these two trace fossils are changes in brackish water conditions and grain size. Both of these two types of pathogenic organisms belong to the explosive population of opportunistic species formed under high environmental pressure and thus indicate the lowest salinity of 05% ~ 09% Of the salinity of the depositional environment, but also that the pale warm climate during this period accompanied by a large amount of periodic precipitation