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.
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Showing 1 to 20 of 70 for “"Early Cretaceous"”.
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Early cretaceous belemnites from Southern India
… (1861-65). The Karai Formation ranges from the Early Albian through to the late Turonian in age. The belemnites in this study were collected from the sediments of Albian age. Over 3500 belemnites were collected of which, 2 families and three genera were identified. The belemnite fauna is rich …
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Stratigraphic and Geochemical Expression of Early Cretaceous Environmental Change in Arctic Svalbard
… in the traditionally “greenhouse” period of the Cretaceous. Climate conditions are often assumed to have been warm-temperate as evidenced by the presence of conifers and dinosaur trackways on Svalbard and other Arctic localities. However, isotopic evidence for cooling episodes, sequence …
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Digital Dissection of Radiographs, Using the Early Cretaceous Bird Confuciusornis and Photoshop CS2TM
In the past, radiographs (x-ray "shadowgraphs") have been used by paleontologists as ways to identify and capture bone images. Primarily, this was done to examine the skeletal elements without having to remove the surrounding matrix. Radiographs have so much three-dimensional information …
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The palynology, palynofacies and palaeoenvironment of the early cretaceous Weald clay of Southeast England
This study attempts to show that cluster groupings of rock samples based on spore/pollen content in the Weald Clay represent particular palaeoenvironments.
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Stable Isotope Geochemistry and Paleohydrology of the Poison Strip Sandstone, Early Cretaceous, Eastern Utah
… Strip Sandstone Member is a unique unit in the early Cretaceous Cedar Mountain Formation of eastern Utah. A previous chemostratigraphic study of the Poison Strip Sandstone at the Ruby Ranch Road (RRR) section east of Green River, Utah produced a noteworthy dataset with interesting δ18O results …
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THE LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY (FORAMINIFERA) OF THE EARLY CRETACEOUS OF THE SOUTHERN NORTH SEA BASIN
… literature there is little information on the Early Cretaceous strata of the Southern North Sea Basin (Mesozoic Basin). The small amount of Information that has been published i s the result of the search for hydrocarbons (see Chapter 2) . This thesis attempts to remedy the lack of information …
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Late Jurassic to Early Cretaceous stable isotope and geochemical records from the northern high latitudes: implications for palaeoclimate
The Jurassic and Cretaceous periods are widely accepted as being dominated by greenhouse conditions with elevated CO2 levels and warm polar regions. Although much compelling evidence to support this idea of global warmth exists, some recent studies propose that the greenhouse climate may at times …
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Controls on Stratigraphy and Architecture of Shallow-Water Deltas: Examples from the Early Cretaceous of Central-Eastern Spain
… project focuses on a spectacularly well-exposed Early Cretaceous fluvio-deltaic succession of the Maestrazgo Basin in central-eastern Spain. These were deposited in a semiisolated, tectonic rift sub-basin during a rifting cycle from the Upper Jurassic to Middle Cretaceous. The succession displays …
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Hydrodynamics of formation fluids related to depositional systems in the Bow Island-Viking succession (early Cretaceous) of western Saskatchewan.
Dept. of Geology and Geological Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1989 .N935. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.Sc.)--University of Windsor (Canada), 1989.
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Interpretation and Fracture Characterization of Early-Cretaceous Buda Limestone Formation Using Post-Stack 3D Seismic Data in Zavala County, Texas
<p>The Buda Limestone is a naturally fractured Early Cretaceous carbonate formation in south Texas which unconformably underlies the Eagle Ford Shale. Matrix porosity of the Buda is less than 6%, therefore natural fractures improve the potential for commercial hydrocarbon production from this tight …
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Thermo-tectonic record of hyperextension, structural inversion, and foreland basin evolution of the eastern and central Pyrenees
… basin development. This work constrains the Early Cretaceous hyperextension history along the Iberia-European margin and how rift inheritance affected the structural and foreland basin evolution of the Late Cretaceous-Oligocene Pyrenean orogeny. Chapters 1 and 2 aim to understand the thermal …
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A quantitative approach to the evolution of the central Walvis Basin offshore NW-Namibia : structure, mass balancing, and hydrocarbon potential
… breakup of Westgondwana in the Late Jurassic/ Early Cretaceous initiated the formation of the South Atlantic and its conjugated pair of passive continental margins. The Walvis Basin offshore NW-Namibia is an Early Cretaceous to recent depositional centre with a typically wedge-shaped postrift …
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The thermal history of the western lower Saxony Basin, Germany
… of Upper Campanian rocks overlying the Lower Cretaceous units, a late Early Cretaceous or early Late Cretaceous age was concluded for the time of intrusion. Vitrinite reflectances for the central and southern part of the LSB confirm a low reflectance increase with depth which is more likely …
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Reconstructing long term sediment flux from the Brooks Range, Alaska using shelf edge clinoforms
… well-developed clinoforms have been mapped in Early Cretaceous deposits located in the northeastern 27,000 km2 of the Colvile Basin, North Slope of Alaska. Using public domain 2-D seismic data, well logs, core photographs, and grain size data, depositional geometries within the Nanushuk and …
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Reconstructing long term sediment flux from the Brooks Range, Alaska, using edge clinoforms
… well-developed clinoforms have been mapped in Early Cretaceous deposits located in the northeastern 27,000 km2 of the Colville Basin, North Slope of Alaska. Using public domain 2-D seismic data, well logs, core photographs, and grain size data, depositional geometries within the Nanushuk and …
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A PALAEOMAGNETIC STUDY OF CRUSTAL ROTATIONS AND THEIR RELATIONSHIP TO THE TECTONICS OF THE ATACAMA AND DOMEYKO FAULT SYSTEMS, NORTHERN CHILE
… (La Negra Formation) and Middle Jurassic to Early Cretaceous dyke swarms reveal a consistent clockwise rotation of approximately 42°. The remanence from the La Negra Formation passes both fold and reversal tests and is interpreted as a pre-folding remanence. Four of the five dyke swarms have …
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Recalibrating the breakup history of SW Gondwana: the first U-Pb chronostratigraphy for the Uitenhage Group, South Africa
… framework for the onshore Jurassic – Cretaceous in the southern Cape. To further improve precision and accuracy, a selection of crystals from four pyroclastic deposits in key stratigraphic positions were selected for single-zircon Chemical Abrasion – Thermal Ionisation Mass …
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HlGH RESOLUTION PALAEOMAGNETIC ANALYSES OF CRETACEOUS SHALLOW WATER CARBONATES
… of 88 m of continuous borehole cores of Lower Cretaceous shallow water carbonates from Southern Italy was obtained and studied lithologically and palaeomagnetically. It was found that the rocks are organized in cyclic lithofacies representing depositional environments from subtidal to …
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Petrogenesis of the False Bay dyke swarm, Cape Peninsula, South Africa
… False Bay dyke swarm is the southern-most set of Early Cretaceous dolerite dyke intrusions along the western margin of southern Africa associated with rifting of Gondwana and opening of the South Atlantic Ocean. Previous work highlighted the evolution of a single magma type from olivine-tholeiite …
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