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Kl Introduction K2 Geologic setting K2 Sampling and analytical methods K6 Results Kll Organic carbon and sulfur Kll Rock-Eva! pyrolysis K12 Bitumen yield and composition K15 Gas chromatography-mass spectrometry K15 Porphyrins K16 Stable carbon isotopes K19 Organic-matter source K19 Evidence from biomarkers and sulfur K19 Evidence from stable carbon isotopes K25 Organic-matter preservation K28 Recognition of hypersalinity K33 Petroleum source-rock potential K35 Conclusions K39 References cited K40

Organic geochemistry of black shales, marlstones, and oils of Middle Pennsylvanian rocks from the northern Denver and southeastern Powder River basins, Wyoming, Nebraska, and Colorado