“…The upper section of the Baoyintu Group is dominated by quartz schist, interbedded with quartzite and lamellar marble lens; however, a thrust fault between these two units exists (Inner Mongolia BGMR, ). Following the latest Paleoproterozoic event, near‐continuous Mesoproterozoic‐Neoproterozoic sedimentation of the Bayan Obo Group is observed (Inner Mongolia BGMR, ; Zhou et al, , ; Zhou, Hu, et al, ; Zhou, Wang, et al, ). The strata can be divided into three distinct successions: the Changcheng (i.e., late Paleoproterozoic), Jixian (i.e., early Mesoproterozoic), and Qingbaikou (i.e., early Neoproterozoic; Liu et al, ; Sun et al, ; Wan et al, ; Zhou et al, ; Zhou, Hu, et al, ; Zhou, Wang, et al, ).…”