Paleosalinity significance of occurrence and distribution of methyltrimethyltridecyl chromans in the Upper Cretaceous Nenjiang Formation, Songliao Basin, China

► Methyltrimethyltridecyl chromans were detected in an Upper Cretaceous lacustrine basin in China. First time found in Chinese sediments older than Tertiary. Their occurrence is indicative of the redox and salinity conditions in the depositional environments. Massive Cretaceous lacustrine source rocks in the Songliao Basin were deposited under a stratified water column.