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 5 of 5 for “"Tonian"”.
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Geochemical investigation of the co-evolution of life and environment in the Neoproterozoic Era
… dominance in marine ecosystems during the Tonian Period (1000 Ma to 720 Ma). To assess whether the availability of nitrate, an important macro-nutrient, played a critical role in this evolutionary event, nitrogen isotope compositions (δ<sup>15</sup>N) of marine carbonates from the early …
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Efficient Fock Space Configuration Interaction Approaches For Large Strongly Correlated Systems
… double exchange behavior. Model Hamil- tonian parameters are extracted from energy gaps and found to be in qualitative agreement with experiment. Having shown the efficacy of this approach, we move on to optimization, using a diagrammatic approach to derive equations for several …
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Paleobiology, Biostratigraphy, and Taphonomy of Neoproterozoic Eukaryotes and Cambrian Animals with Carbonaceous Preservation
… suggesting that the lower Gouhou Formation is Tonian in age and the P-C boundary may be located within the Gouhou Formation. Chapter four reports a group of problematic carbonaceous compression macrofossils from the Hetang Formation in South China. Taphonomic analysis using optical and electron …
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Estilo estrutural e contexto tectonoestratigráfico do Grupo Ubajara no NW do Ceará
… the Martinópole Group (also of neoproterozoic, tonian age, deformed at a higher strain and metamorphic grade) and gneissic-migmatitic terrains (paleoproterozoic to archaean). In its SE border, the Ubajara Group is in contact, through a NE-trending dextral transcurrent fault, with the …