Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"paleochannel"”.
-
Fossil preservation and the effects of groundwater leaching on fossils in the Yorktown Formation (Upper Pliocene), Virginia
… movement, controlled by the presence of the paleochannel, caused diagenetic alteration or complete dissolution of the fossils, and possibly caused precipitation of fine-grained iron oxyhydroxides. All carbonate material in the vicinity of the paleochannel is completely dissolved away, …
-
Multi-Scale Mapping of Diagenetic Processes in Sandstones Using Imaging Spectroscopy: A Case Study of the Frontier Formation (Wyoming, U.S.A.) and the Utrillas Formation (Burgos, Spain)
… well-ordered authigenic kaolinite is related to paleochannel deposits and organic rich irregular patches. Meteoric water flux probably induced feldspar and mica alteration, and authigenic clays precipitation. Contemporary bacterial degradation of organic matter might be the cause of authigenic …
-
Microbial carbon within and above exotic copper deposits in northern Chile : implications for ore genesis and exploration
… and Mina Sur deposits; and soils overlying a paleochannel in the Huinquintipa area known to be mineralised. The samples were processed using four different analytical techniques to determine their 13C values: (1) Elemental Analysis Isotope Ratio Mass Spectrometry (EA/IRMS) of the whole …
-
Sedimentology of the Bullion Creek and Sentinel Butte formations (Paleocene) in a part of southern McKenzie County, North Dakota
… primary sedimentary structures, positions of paleochannel outcrops were noted, and samples were collected. Laboratory work consisted of thin-section petrography, scanning electron microscopy, and X-ray diffraction analyses of sand stones, limestones, and claystones, respectively.</p> <p>Two …
-
Configuration of the Pleistocene Surface Beneath Cat Island, Mississippi and Implications for Barrier Island Formation and Evolution
… situated over an Oxygen Isotope Stage 3 Phase 3 paleochannel located between two topographic high-grounds of the Pleistocene surface. Beach ridge strandplain sets on Cat Island provide additional evidence supporting the island's formation over a relict depocenter. A new, 4-stage model for Cat …
-
Spatial Characteristics of Paleochannels in Association with the Mississippian/Pennsylvanian Systematic Boundary in Western and South-Central Kentucky
… Kentucky includes an extensive network of paleochannels, which unconformably overlie various Mississippian (Chesterian Series) rocks. Questions have been raised about the extent and orientation of paleochannels and the systemic boundary in the region. The problematical systemic boundary is …
-
Investigating rates and mechanisms of lateral erosion in a small bedrock river using erosion pins, structure-from-motion photogrammetry, and optically stimulated luminescence dating: Konza Prairie, northeast Kansas
… information about rates of lateral erosion and paleochannel mobility, thus improving our understanding of the timing and processes linked to how bedrock rivers erode laterally to form wide bedrock valleys
-
Geoarchaeology of the Orontes River Floodplain Surrounding Tell Qarqur, Syria
… development. Description of sediments in a paleochannel of the Orontes River north of Tell Qarqur and floodplain deposition south and east of the site reveals a pattern of early-mid Holocene proximal overbank flood deposits followed by mid-late Holocene distal overbank deposits. There is a …
-
Interpretation of coarsening upwards hemicycles in the Upper Paleozoic rocks of South-central West Virginia
… indicate that most of the Carboniferous paleochannel were relatively small and had a mean annual discharge in the range of 1800 to 5100 cfs, though one channel had a mean annual discharge of about 22000 cfs. However, these results should be considered at best an approximation because of …