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Study of a portion of the Upper Cretaceous Mancos Shale in the San Juan Basin of New Mexico shows that organic facies deposited on the shelf change noticeably at surfaces that have sequence stratigraphic significance. Shelf sediments below transgressive surfaces contain abundant, well-preserved terrestrial organic matter (phytoclasts) whereas sediments above transgressive surfaces contain sparse and highly degraded phytoclasts and more hydrogen-rich organic matter. Shelf sediments associated with the maximum flooding surface typically contain the least terrestrial organic matter. These results indicate that the type and preservation of organic matter is related to both the rate of terrigenous sediment supply...

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