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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Primary terms
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Africa
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Cenozoic
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Paleogene
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Calvert Bluff Formation (3)
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Eocene
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lower Eocene
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Cuisian (1)
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Sparnacian (1)
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Wind River Formation (1)
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middle Eocene
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Carrizo Sand (2)
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Yegua Formation (2)
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Nanjemoy Formation (1)
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upper Eocene
-
Jackson Group (4)
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-
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Kenai Group (1)
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Oligocene
-
upper Oligocene
-
Chattian (1)
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-
-
Paleocene
-
Bullion Creek Formation (1)
-
lower Paleocene
-
Danian (1)
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K-T boundary (4)
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Puercan (1)
-
-
Ravenscrag Formation (2)
-
-
Paleocene-Eocene Thermal Maximum (1)
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Tyonek Formation (2)
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upper Paleogene (1)
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Wilcox Group (9)
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Tokai Group (1)
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Central America
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lignite
Neogene sedimentary record of the evolution of a translated strike-slip basin along the Denali fault system: Implications for timing of displacement, composite basin development, and regional tectonics of southern Alaska
Middle Miocene palynoflora from the Adamów lignite deposit, central Poland
Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland
Geologic and Geochemical Features of Cretaceous Ge-Bearing Lignites in the Yenisei Middle Reaches
Controls on sedimentation and vegetation in an Eocene pull-apart basin (Prinz von Hessen, Germany): evidence from palynology
Authigenic Mineralization in Low-rank Coals from the Velenje Basin, Slovenia
A reinterpretation of the ages and depositional environments of the lower and middle Miocene stratigraphic records in a key area along the southern margin of the North Sea Basin
THE SIGNIFICANCE OF PEATLAND AGGRADATION IN MODERN AND ANCIENT ENVIRONMENTS
Age and Origin of the Well-Preserved Organic Matter in Internal Sediments from the Silesian-Cracow Lead-Zinc Deposits, Southern Poland
The geometry, distribution and development of sand bodies in the Miocene-age Frimmersdorf Seam (Garzweiler open-cast mine), Lower Rhine Basin, Germany: implications for seam exploitation
A new earliest Paleocene (Puercan) mammalian fauna from Colorado's Denver Basin, U.S.A.
Thermal-maturity limit for primary thermogenic-gas generation from humic coals as determined by hydrous pyrolysis
Questions of biotic and environmental change during deposition of the Upper Maastrichtian Hell Creek Formation require a robust and replicable system for intra-formational correlation of fossil localities. In this paper, we present a carbon isotope chemostratigraphic curve based on terrestrial organic carbon. Data were taken from a complete measured section spanning the full 93 m of the Hell Creek Formation at our study site. Sedimentary beds were described at the centimeter scale, and samples for carbon isotope analysis were taken at ~10 cm intervals. Each sedimentary bed was analyzed in thin section, and grain-size data were assembled based on petrographic point counts. The well-documented Cretaceous-Paleogene boundary negative carbon isotope excursion, six negative carbon isotope excursions, and four tentative positive carbon isotope excursions provide chronostratigraphic tie points within the Hell Creek Formation. We used this curve to precisely correlate 12 additional fossil-bearing localities from throughout the Hell Creek Formation across its type area. These correlations revealed significant local variation in sediment accumulation rates, confirming that simple stratigraphic position relative to the diachronous base and top of the Hell Creek Formation introduces significant error in correlation.