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Showing 1 to 20 of 128 for “"Paleocene"”.
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A magmatic trigger for the Paleocene-Eocene Thermal Maximum?
… of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light …
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Petrology of the Sentinel Butte Formation (Paleocene), North Dakota
… formation indicates that volcanism accompanied Paleocene sedimentation and that volcanic glass can be preserved for longer periods of geologic time than commonly thought possible. The manner of preservation of the bentonite/ ash unit makes it ideally suited for testing the usefulness of chemical …
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A magmatic trigger for the Paleocene-Eocene thermal maximum?
… of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light …
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Macrofossil Biostratigraphy of the Cannonball Formation (Paleocene) in North Dakota
… stratigraphy and paleontology of the marine Paleocene Cannonball Formation has been the subject of study since the early 1900s. The formation can be divided into three principal intervals, each consisting of a sandstone/mudstone pair: the upper, middle, and lower intervals. …
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The stratigraphy and geologic history of the Cannonball Formation (Paleocene)
<p>The purpose of this report is to describe the stratigraphy of the Cannonball formation in southwestern North Dakota, and to present a new geologic map of the formation in Oliver, McLean, Burleigh, and Emmons Counties, North Dakota.</p>
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Bivalve associations of the Cannonball Formation (Paleocene, Danian) of North Dakota
<p> The Cannonball Formation (Paleocene, Danian) is best exposed in southwest-central North Dakota. Here, two major lithotypes, mudstone and sandstone, occur. In this area, the Cannonball can be informally subdivided into four lithologic units: lower (primarily thinly-bedded sandstone and …
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Depositional environments of the lower Tullock Formation (Paleocene), Slope County, southwestern North Dakota
<p>The lower Tullock Formation (Paleocene), which consists of a section 5 to 30 feet thick, was studied in Slope County, southwestern North Dakota to determine its depositional environments. The lithol ogies present are sand, silt, clay and lignite. A bed of lignite or yellow silt marks the base of …
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Paleoclimate and mammal paleocology during the paleocene of North America: insights from stable isotopes.
Paleocene climate and its relationship to mammal ecology and biogeography were examined at continental scale to test for long-term stasis of ecogeographical patterns among mammals and to better understand the effects of climate change on mammalian faunal dynamics. I also investigated local …
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Stratigraphy and Palaeoenvironment of the Paleocene/Eocene boundary interval in the Indus Basin, Pakistan
Marine sedimentary sections across the Paleocene/Eocene (P/E) boundary interval are preserved in the Patala Formation (Upper Indus Basin) and Dungan Formation (Lower Indus Basin), Pakistan. The P/E interval of the Patala Formation is composed of limestone and shale inter-beds indicating deposition …
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Fort Union (Paleocene) mollusks from southern Golden Valley and southeastern Billings counties, North Dakota
<p>Nine molluscan species are known to occur in Tongue River Sentinel Butte sediments of parts of Billings, Golden Valley, and Slope Counties in southwestern North Dakota. Tongue River sediments contain all nine of the species which include: two unionids, Plesielliptio priscus (Meek and Hayden) and …
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Campanian-Maestrichtian and Paleocene dinoflagellate and acritarch assemblages from the Maryland-Delaware Coastal Plain
… and biostratigraphy of Upper Cretaceous and Paleocene dinoflagellate and acritarch assemblages from the Maryland-Delaware Coastal Plain have been investigated from strata outcropping near Washington, D.C., to the eastern end of the Chesapeake and Delaware Canal, Delaware. Samples of the …
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Petrology of the Beulah-Zap lignite bed, Sentinel Butte Formation (Paleocene), Mercer County, North Dakota
… lignites in the Sentinel Butte Formation (Paleocene). This lignite occurs as a subsurface unit in the Knife River Basin of Mercer and I Oliver counties of North Dakota. The Beulah-Zap lignite is a heterogeneous carbonaceous rock unit composed of megascopic and microscopic I components, …
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Stratigraphy and sedimentology of the Tongue River formation (Paleocene), southeast Golden Valley County, North Dakota
<p>The exposed Tertiary rock units in southeast Golden Valley County, North Dakota were measured and described with particular emphasis on the Tongue River Formation. Lithologic samples were collected and analyzed for total carbonate content, particle size, particle roundness, and mineral …
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Earliest Known Material of Amia, Bowfin, From The Sentinel Butte Formation (Paleocene), Medora, North Dakota
… cf. A. pattersoni</em>, was a specimen from the Paleocene epoch of Alberta, Canada approximately 58 million years in age. Fossils of the two unidentified species of <em>Amia</em> were found in the Sentinel Butte Formation, a geologic formation of Paleocene age (~ 60 million years ago) near the …
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Late cretaceous (Maestrichtian) calcareous nannoplankton biogeography with emphasis on events immediately preceding the cretaceous/paleocene boundary
… the biospheric turnover at the Cretaceous/Paleocene (KIP) boundary have alternatively suggested or denied substantial environmental perturbations during the last ~500 ky of the Cretaceous. The purpose of this study is to determine whether evidence from calcareous nannoplankton supports a …
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The Rhame bed (Slope Formation, Paleocene), a silcrete and deep weathering profile, in southwestern North Dakota
… in the Fort Union Group deposited during Paleocene time.</p> <p>The Rhame Bed was mapped in western Slope County and north central Bowman County. The bed outcrops on the tops of buttes, at the present groJnd surface in large level areas, or in steep slopes. Although the bed is laterally …
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A mineralogical study of the Harmon lignite bed, Bullion Creek Formation (Paleocene), Bowman County, North Dakota
… bed is part of the Bullion Creek Formation (Paleocene). Objectives of this study included: to develop scanning electron microscope/microprobe techniques for the study of minerals in coal; to determine the origins of the mineral phases; to postulate a depositional environment for the Harmon …
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Depositional environments of a portion of the Bullion Creek Formation (Paleocene), Western Billings County, North Dakota
<p> The Bullion Creek Formation (Paleocene) in North Dakota is part of an Upper Cretaceous to Eocene wedge of siliciclastic rocks formed during uplift associated with the Laramide Orogeny. The Bullion Creek Formation consists predominantly of mudrocks , with fine-grained sandstone, lignite, and …
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High- and low-sinuosity stream deposits of the Sentinel Butte Formation (Paleocene) McKenzie County, North Dakota
… a delta. The delta may have prograded into the Paleocene sea in which the marine Cannonball Formation was deposited.</p>
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