Essays about: "Triassic"

Showing result 6 - 10 of 17 essays containing the word Triassic.

  1. 6. Assessing the biodiversity crisis within the Triassic-Jurassic boundary interval using redox sensitive trace metals and stable carbon isotope geochemistry

    University essay from Lunds universitet/Geologiska institutionen

    Author : Halla Margrét Viðarsdóttir; [2020]
    Keywords : Stenlille; Schandelah; redox conditions; C-isotopes; marine sediments; trace elements; enrichment factors; mass extinction; Triassic – Jurassic boundary; Earth and Environmental Sciences;

    Abstract : Around the Triassic-Jurassic-Boundary time interval, a severe mass extinction event occurred, which has been associated to volcanism of the Central Atlantic Magmatic Province (CAMP). Significant amounts of greenhouse gases as carbon dioxide (CO2) or methane (CH4) and other volatiles are suggested to have been released into the atmosphere, leading to global warming with subsequent impact on the biosphere. READ MORE

  3. 7. Lateral variability in the quantification of calcareous nannofossils in the Upper Triassic, Austria

    University essay from Lunds universitet/Geologiska institutionen

    Author : Andreas Fägersten; [2018]
    Keywords : Calcareous nannofossils; Upper Triassic; Steinbergkogel; lateral variability; limestone; Earth and Environmental Sciences;

    Abstract : Calcareous nannofossils are microscopic remains of organisms that diversified considerably in and after the Late Triassic, and which may have influenced seawater chemistry and carbonate production. Coccoliths, nannoliths, and calcareous dinoflagellate cysts are important parts of many calcareous nannofossil assemblages in the Upper Triassic. READ MORE

  4. 8. Dynamics of Selachian (Shark) Dental Morphology During the Early Mesozoic

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Alexander Paxinos; [2017]
    Keywords : Early Mesozoic; Selachii; morphological disparity; geometric morphometrics; early radiation; Tidig Mesozoisk; Selachimorpha; morfologisk disparitet; geometrisk morfometri; tidig strålning;

    Abstract : The ancestors of all modern day sharks and rays (Neoselachii) may have appeared during the Late Palaeozoic, but their major diversification happened sometime during the Early Mesozoic. Taxonomic evidence places the first neoselachian diversification in the Early Jurassic. READ MORE

  5. 9. The Jurassic extinction events and its relation to CO2 levels in the atmosphere : a case study on Early Jurassic fossil leaves

    University essay from Lunds universitet/Geologiska institutionen

    Author : Liina Santasalo; [2013]
    Keywords : conifers; Pliensbachian; Australian; Early Jurassic; stomatal proxy; palaeo-CO2; koldioxidhalt; klimat; Australien; tidig Jura; Marburg subgroup; Allocladus helgei; stomata index; CO2; Earth and Environmental Sciences;

    Abstract : The Mesozoic was a so-called “hothouse” time period in Earth’s history, with high concentrations of atmospheric CO2 and elevated temperatures, but the exact climate evolution is not fully known for the entire inter-val. The Early Jurassic for instance is believed to have been a warm period, flanked by two episodes of extremely high CO2, coinciding with environmental degradation and mass extinctions: the Triassic-Jurassic (200 Ma) and the early Toarcian (183 Ma) mass extinction events. READ MORE

  6. 10. Subsurface geological setting in the Skagerrak area : suitability for storage of carbon dioxide

    University essay from Lunds universitet/Geologiska institutionen

    Author : David Weibull; [2012]
    Keywords : geology; CCS; Skagerrak; koldioxidlagring; CO₂; Earth and Environmental Sciences;

    Abstract : Som en effekt av den globala strävan som syftar till att motverka klimatförändringar som tillskrivs ökande koldioxidnivåer i atmosfären försöker man hitta okonventionella sätt att minska koldioxidutsläpp. CCS anses vara en metod med stor potential för detta syfte vilket har föranlett en världsomspännande prospektering av platser som kan användas för geologiskt lagring av koldioxid. READ MORE