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The Lower Cretaceous Yixian Formation in northeast China mainly contains the Jehol Biota. Notable investigations of the area have led to the discovery of feathered dinosaurs, angiosperms and numerous other exceptionally well‐preserved fossils. The Yixian Formation is mostly composed of basalts interbedded with siliciclastic sediments that can be divided into several beds (from lower to upper layers,...
The first and second members of the Nenjiang Formation (K2n1+2) in the Songliao Basin, northeast China, are an interval of dark-colored mudstone. Paleoenvironmental studies of these strata are useful for understanding the terrestrial environment under a greenhouse climate and hydrocarbon accumulation in lake basins. In this study, clay mineralogy of the K2n1+2 from four borehole or outcrop sections...
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