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在湖北保康马桥地区，新元古代神农架群石家冲组中产出一套奇异的叠层石、凝块石和叠层石－凝块石联合体。其中叠层石具有类似于食草和钻孔动物破坏的疤痕。通过对上述构造形态和特征分析，这些构造可能与后生动物的活动有关，但也不排除它们是非生物成因的可能。这些后生动物似乎已显示高度发育的行为。当前的资料表明，在凝块石构造与食草和钻孔动物生态效应之间似乎存在着一种紧密的联系。在生物进化史上，寒武纪生命大爆发似乎仅是一种表面现象，因为较古老的后生动物由于缺少硬壳部分和合适的埋藏条件，而无保存能力。
In the Baokang Maqiao area of Hubei province, a set of strange monoliths, clinker stones and monoliths-clinker complexes have been produced in the Shijiazhong Formation of the Neoproterozoic Shennongjia Group. Among them, laminated rocks have scars that resemble the destruction of herbivores and boreholes. By analyzing the above configuration and features, these structures may be related to the activity of the metazoan, but they are not ruled out that they may be abiotic causes. These metazoans seem to have shown a high degree of developmental behavior. The current data suggest that there seems to be a close link between the clot structure and the ecological effects of herbivores and boreholes. In the history of biological evolution, the Cambrian explosion of life seems to be only a superficial phenomenon, as the older metazoans have no preserving power due to the lack of hard shell parts and suitable burial conditions.