The bimodal association of acidic and mafic volcanic rock suggests that some supracrustal rocks were formed under continental rift.
双峰式的酸性和基性火山巖组合的存在也证明部分表壳巖是形成在大陆环境。
The Mengjiatun Formation complex is a suite of supracrustal rocks formed in the early Neoarchean, and its typical rocks include garnet quartzite, biotite-quartz schist and amphibolite.