Chemical composition data of sedimentary rocks from the Permian-Triassic boundary and Cretaceous oceanic anoxic events

Bulk chemical composition data of sedimentary rocks from the Permian-Triassic boundary and Cretaceous oceanic anoxic events. This is a supplementary dataset for “Geochemical variations in sedimentary records of oxygen-depleted marine environments in representative geological periods: New perspectives from a multivariate statistical technique” by Moei Yano et al.