Essays about: "Oncoids"

Found 3 essays containing the word Oncoids.

  1. 1. Record of the end-Triassic mass extinction in shallow marine carbonates: the Lorüns section (Austria)

    University essay from Lunds universitet/Geologiska institutionen

    Author : Linus Brakebusch; [2022]
    Keywords : sedimentology; geochemistry; ooids; oolites; oncoids; oncolites; Triassic; Jurassic; Rhaetian; Hettangian; ocean acidification; Earth and Environmental Sciences;

    Abstract : The end-Triassic mass extinction (ETE) was one of the five big mass extinctions of the Phanerozoic and occurred ~201 Ma ago. Research agrees that the main triggering factor for the ETE was the eruptions of the Central Atlantic Magmatic Volcanic Province (CAMP), linked to the break-up of the supercontinent Pangaea. READ MORE

  3. 2. Sedimentary Factories and Ecosystem Change in the Triassic-Jurassic Boundary Interval : Insights from the Skåne Area (Southern Sweden)

    University essay from Uppsala universitet/Paleobiologi

    Author : Gustav Nesset Mattsson; [2021]
    Keywords : CAMP; microbial structures; End-Triassic extinction event; sedimentary structures; MISS; Triassic-Jurassic boundary; CAMP; mikrobiella strukturer; Trias-jura-utdöendet; sedimentära strukturer; MISS; Trias- juragränsen;

    Abstract : The End-Triassic Extinction (ETE) has long remained one of the lesser known among the so-called “Big Five”. There exist several hypotheses regarding the probable cause of this extinction, which can mainly be divided into  events of  a decline in the rate of diversification  in the late Triassic contra a sudden and significant extinction event. READ MORE

  4. 3. An interpretation of oncoid mass-occurrence during the Late Silurian Lau Event, Gotland, Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Martin Qvarnström; [2012]
    Keywords : Bjärsjölagård; Gotland; microbialites; Silurian; Oncoids; Lau Event; ecological crisis; Onkoider; Silur; microbialiter; ekologisk kris; Earth and Environmental Sciences;

    Abstract : The geological significance of the microbial-formed oncoid is not as well understood as the recognized, analogous stromatolite but can, as well be used as an environmental indicator. In association with the larger Phanerozoic mass extinctions, a resurgence of microbialites as a disaster fauna is at present an accepted view. READ MORE