Issues

ON COVER – The newly discovered highquality source rock from Cambrian Yuertusi Formation in the Aksu area, Tarim Basin, China. These rocks are black shales and typically have a total organic carbon content between 2% to 6%. The overlying Cambrian dolomites in association with a salt seal exhibit favorable geological conditions for large-scale hydrocarbon accumulation. A new set of deep exploration strata can, therefore, be developed, guiding future deep Cambrian hydrocarbon exploration in the Tarim Basin. See related article by Zhu et al., p. 2123, this issue of the Bulletin.