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 14 of 14 for “"Paleoenvironmental conditions"”.
-
Applied Geochemistry, Geochronology and Biostratigraphy: Case Studies from the 38th Parallel Structures in Missouri and Orange Basin, Offshore Western South Africa
… these enigmatic structures and infer their paleoenvironmental conditions. Novel melting damages, unique to impact, were documented in the palynomorphs in all the three structures. Early Ordovician acritarchs with melted processes correlate with <sup>40</sup>Ar-<sup>39</sup>Ar stepwise …
-
Paleocommunities of the Yorktown Formation (Pliocene) of Virginia
… types which occured under specific paleoenvironmental conditions were defined: rubbly bottom, transitional, and muddy bottom. Within a single locality samples from the same paleocommunity type yielded very similar faunal compositions, based on the relative abundance of the contained …
-
Late quaternary Alaskan paleoclimate : geoarchaeological insights into the Pleistocene-Holocene transition.
… environmentally and climatically. These changing conditions likely contributed to the changes in human behavior observed in the earliest human inhabitants who migrated into the region sometime within this time period. In order to better understand the relationship between shifting …
-
Sequential Isotopic Analysis of Ammonite Aptychi
… can be interpreted to reveal information about paleoenvironmental conditions because oxygen isotope ratios can vary based on temperature and oxygen isotope composition of ancient seawater and carbon isotope ratios varies depending on dissolved inorganic carbon (DIC) of the local environment and …
-
Dolomite as a paleoenvironmental archive
… settings, making dolomite an exciting and useful paleoenvironmental proxy. The questions of how ancient dolomite formed — the longstanding “dolomite problem” — therefore has broad implications for our ability to use carbonate rocks to reconstruct surface environments throughout time. Each chapter …
-
Paleo-environmental conditions and tectonic settings of cretaceous-tertiary kaolins in the Eastern Dahomey and Niger Delta Basins in Nigeria.
… between the two continents with respect to paleoenvironmental conditions and tectonic settings during the Cretaceous- Tertiary periods have been concentrated more on the use of flora and fauna as indicators with less application of kaolinite as paleoenviromental proxies, hence, this study. …
-
Assessment of Statistical Methods Applied to Geochemical Data for Paleoenvironmental Interpretation: A Case Study from the Al-Azraq Basin, Jordan
… Lacustrine sediments contain valuable records of paleoenvironmental conditions, recording local and regional responses to environmental chang¬¬e. The Al-Azraq basin is a low lying an endorheic basin draining an area across eastern Jordan, southern Syria and northern western Saudi Arabia of …
-
Sedimentology, ichnology and sequence stratigraphy of the Lower Cambrian Gog Group, southern Rocky Mountains, Canada
… in terms of colonization trends and prevailing paleoenvironmental conditions. The Gog Group in this area has historically comprised four units, the Fort Mountain, Lake Louise, St. Piran and Peyto formations. North of Bow Pass an additional unit, the Jasper Formation, occurs below the Fort …
-
Late cretaceous (Maestrichtian) calcareous nannoplankton biogeography with emphasis on events immediately preceding the cretaceous/paleocene boundary
… is investigated in order to characterize paleoenvironmental conditions in the marine photic zone during the latest Cretaceous. Different theories explaining the biospheric turnover at the Cretaceous/Paleocene (KIP) boundary have alternatively suggested or denied substantial environmental …
-
Responses of a shallow-water ecosystem to the early Paleogene greenhouse environmental conditions : evolution of Larger Foraminifera and coral communities from the Northern Tethys
… studies. In order to reconstruct paleoenvironmental conditions during deposition, I focused on sedimentological analysis and paleoecological study of benthic assemblages. During the Late Paleocene-earliest Eocene, sedimentation occurred on a shallow-water carbonate ramp system …
-
Denudation processes in a tectonically active rift on different time scales
… of species and the change of sedimentary conditions as a result of climatic change. Finally, rifts have increasingly become targets of resource exploration, such as hydrocarbons or geothermal systems. The study of extensional processes and the factors that further modify the mainly …
-
Spatial and temporal variations in the geometry and composition of the Permian Whitehill Formation South Africa
… potential of this resource unit but also the paleoenvironmental conditions that prevailed in the Karoo Basin during its accumulation. Following the recent global proliferation of unconventional hydrocarbon resources originating in organic-rich shale successions, the WHF is seriously being …
-
PCO2 EFFECTS ON THE PRODUCTION OF PELAGIC BIOGENIC CARBONATE AND OCEAN CHEMISTRY: A CASE HISTORY FROM THE CRETACEOUS.
… organic carbon-rich sediments under oxygen-poor conditions, named the Oceanic Anoxic Event 1a (OAE1a) (~120 Ma) which has its sedimentary expression in the Selli Level. OAE1a represents a profound perturbation of the ocean-atmosphere system caused by natural CO2 emissions related with climate …
-
Sedimentary lipids as indicators of depositional conditions in the coastal Peruvian upwelling regime
… indicators of short-term changes in depositional conditions and sedimentary organic matter sources in the coastal upwelling regime off of Peru. A variety of lipids (n-alkanes, n-alkanols, C37 alkenones, hopanoids, keto-ols, lycopane, phytol, stenols, stanols, sterenes, and tetrahymanol) were …