“…This was demonstrated by Song et al (2017), who describe distinct phases of MRB deposition from five Phanerozoic periods (Cambrian, Devonian, Triassic, Jurassic, and Cretaceous). Furthermore, MRBs related to periods of oceanic anoxia such as the Mid-Late Ordovician (Bábek et al, 2021a;Degtyarev et al, 2021;Liu et al, 2021) and the Early Triassic (Baud, 2013;Li et al, 2019) have been reported. There is an increasing number of detailed geochemical studies that describe, characterize and interpret Phanerozoic MRBs aside from the Cretaceous (Lajoie and Chagnon, 1973;Kiipli et al, 2000;Bábek et al, 2018Bábek et al, , 2021aBábek et al, , 2021b, although notably for the Carboniferous they are lacking.…”