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 11 of 11 for “"Geological events"”.
-
Phylogeny and Biogeography of Ice Crawlers (Insecta: Grylloblattodea): Evidence from Six Molecular Loci
… are possible based on these data. Fossils and geological events provide little evidence for dating grylloblattid divergence times. At least six Grylloblatta lineages existed before the end of the Pleistocene glaciation. Conservation status for each lineage is proposed, based on IUCN Red List …
-
Cretaceous bryozoan fossils from Needs Camp, South Africa
… attention, despite the country's very rich geological and fossil heritage conservation. Published literature regarding bryozoan fossils from South Africa comprise of four papers with the most recent being a little over two decades old. The upper and lower Needs Camp quarries in the Igoda …
-
Studying subduction zone dynamics and continental evolution in South America using data-oriented geodynamic models
… remains one of the least explored regarding its geological evolution. This continent possesses the longest subduction zone, the second highest continental plateau and tremendous amounts of volcanic eruption on its western coast. On the eastern coast, the Brazilian highlands that reach more than 1 …
-
A Phylogenetic History of the Tenerife Skink Chalcides viridanus: A multi-locus Coalescent Approach
… observed within-island cladogenesis and the geological history of the island. Since these studies there have been many advances in conceptual, numerical and methodological approaches in phylogenetic analyses. This study aims to revisit the phylogeography of the Tenerife skink, using more …
-
Avian Diversification in the Andes: Understanding Endemism Patterns and Historical Biogeography
… of the Andes. Thus, this thesis proposes that geological events are directly responsible for originating diversity throughout montane environments. Once in the Andes, the diversification of these montane taxa can be explained by events such as the tectonic evolution of the Andes--which created …
-
Multiarray Passive Acoustic Localization and Tracking
… acoustic sources, be they gunfire, animals, or geological events, is crucial to a wide range of applications. The challenge addressed herein is how to best utilize the massive amount of data collected from spatially distributed sensors. Localization in two acoustic propagation scenarios is …
-
Patterns and processes in animal evolution : molecular phylogenetics of Southern Hemisphere fauna : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Genetics
… Hemisphere has an intriguing and complicated geological history that provides an ideal backdrop to study these processes. This thesis focuses on three historical events that illustrate these processes: the proposed marine inundation of New Zealand in the Oligocene, the asteroid impact at the K …
-
High-resolution environmental change in the late Jurassic Kimmeridge clay formation
… Dorset, southern England, for the Rapid Global Geological Events (RGGE) project. Complementary techniques of back scattered electron microscopy, palynology, total organic carbon and atomic H/C ratios were used to determine the fabric structure and composition and the character of the organic …
-
Reinterpreting vintage geophysical data from the Algoa and Gamtoos Basins, South Africa: an integrated sequence stratigraphic framework since the middle Mesozoic
… that is concerned with how genetically related geological successions are deposited in time and space. This requires the integration of diverse types of datasets (drill core, outcrop, wireline, reflection seismic surveys, etc.) to build robust depositional models, the cornerstones of …
-
Systematics of the Relhaniinae (Asteraceae-Gnaphalieae) in southern Africa : geography and evolution in an endemic Cape plant lineage
… clock is used to estimate dates for important events, calibrated using a combination of secondary age estimates, fossil pollen and geological events. The single inferred dispersal to Australasia, which may be responsible for the large diversity of the tribe there, is compared with other dated …
-
Phosphorus Pathways In Deep Time
… formation and across the subsequent reaches of geological time. These minerals act as useful tools for probing the geological history of rocky objects, including the collisional processes through which asteroids and planets may be assembled, or indeed destroyed. However, the mechanisms by which …