https://www.selleckchem.com/pr....oducts/kaempferide.h
Black shale deposited in the transitional period from the Late Ordovician to Early Silurian is the most important source rock and shale gas reservoir in the Yangtze region of South China. However, the source of these sediments is still controversial. In this paper, the changes in total organic carbon (TOC), total sulfur (TS), organic carbon isotopes (δ13Corg), biomarkers, trace elements, and rare earth elements in the Ordovician-Silurian boundary strata of the XK-1 well in northern Guizhou Province, South China, have been systematic
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