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- W1997170518 abstract "Early Cretaceous and early Late Cretaceous deltaic sediments of the Denver basin include the oil-producing D and J sandstones (upper Dakota Group). The very fine- to coarse-grained quartzose sandstones are in part cross-bedded and ripple marked, in part marine, and in part nonmarine; contain coal and carbonaceous or lignitic beds, mud pellets, siderite concretions, interbedded claystones; and in some areas grade laterally and vertically through siltstone into marine shale. Within the J sandstone there is a well-defined delta extending northwestward into the Denver basin in Colorado. There are smaller deltas in western Nebraska, and, between these two areas, there is a narrow marine embayment. A similar deltaic pattern is developed in the D sandstone. Petroleum is concentrated in the parts of the deltas that have the greatest interfingering of marine and deltaic deposits. End_of_Article - Last_Page 344------------" @default.
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- W1997170518 date "1965-01-01" @default.
- W1997170518 modified "2023-09-27" @default.
- W1997170518 title "Cretaceous Deltas in the Denver Basin and Relationship to Petroleum: ABSTRACT" @default.
- W1997170518 doi "https://doi.org/10.1306/a663358e-16c0-11d7-8645000102c1865d" @default.
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