Sökning: "Early Cretaceous"

Visar resultat 1 - 5 av 18 uppsatser innehållade orden Early Cretaceous.

  1. 1. Global Warming Induced by Oceanic Anoxic Event 1a Had a Pronounced Impact on the Early Cretaceous Terrestrial Vegetation of Southern Sweden

    Master-uppsats, Uppsala universitet/Paleobiologi

    Författare :Marcos Amores; [2022]
    Nyckelord :palynology; spore-pollen; biostratigraphy; oceanic anoxic event 1a; high-latitude; Early Cretaceous;

    Sammanfattning : The Mesozoic is punctuated by several rapid global warming events that are marked by the worldwide deposition of organic-rich marine sediments. These events, known as oceanic anoxic events (OAEs), are characterised by intervals where the worldwide carbon cycle suffers a disruption due to major palaeoceanographic and climatic shifts, leading to anoxic marine environments and the creation of black shales. LÄS MER

  3. 2. Litologi, sedimentologi och kolisotopstratigrafi över krita–paleogen-gränsintervallet i borrningen Limhamn-2018

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Emmy Molin; [2019]
    Nyckelord :Limhamn; K—Pg-gränsen; Stevns Klint; De baltoskandiska kallvattenkarbonaterna; Litologi; Kolisotopstratigrafi; C—Pg boundary; The baltoscandian cool water carbonates; Lithology; Carbon isotope stratigraphy; Earth and Environmental Sciences;

    Sammanfattning : Krita-paleogen-gränsen har länge varit central i diskussioner mellan forskare runt om i världen, då den markerar/sammanfaller med utdöendet av 75% av jordens arter till följd av ett enormt asteriodnedslag på Chicxulúbhalvön i Mexiko. Gränsintervallet är vida utbrett i sedimentära lagerföljder som bildades under denna tid, och kan identifieras genom sina unika kemiska egenskaper och karakteristiska litologier skapad av material från nedslaget som spreds kring jorden. LÄS MER

  4. 3. Submarine Alteration of Seamount Rocks in the Canary Islands: Insights from Mineralogy, Trace Elements, and Stable Isotopes

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Aduragbemi Oluwatobi Sofade; [2018]
    Nyckelord :Canary Islands; seamounts; submarine alteration; trace elements; nannofossils; Kanarieöarna; djuphavsberg; undervattensomvandling; spårämnen; nanofossiler;

    Sammanfattning : Seamounts play an important role in facilitating the exchange of elements between the oceanic lithosphere and the overlying seawater. This water-rock interaction is caused by circulating seawater and controls the chemical exchange in submarine and sub-seafloor rocks. LÄS MER

  5. 4. Dinosaur Warfare: Ankylosaur and Theropod Coevolution

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Christopher Freer; [2017]
    Nyckelord :ankylosaur; theropod; coevolution; phenotypic mismatch; red queen; tyrannosaurid; ankylosaurier; theropoder; samevolution; phenotypic mismatch; röd drottning; tyrannosaurid;

    Sammanfattning : Ankylosauria is a clade of armoured dinosaurs that, throughout the Mesozoic, demonstrates divergent evolution of defensive traits, between the robust spikes and osteoderms of nodosaurids to the ankylosaurid tail clubs and lightweight armour. One of the longer-standing hypotheses, which is supported by histological data, stipulates that armament was a direct result of a predator-prey relationship between theropods and ankylosaurians. LÄS MER

  7. 5. Embryologi och tidig ontogeni hos mesozoiska fisködlor (Ichthyopterygia)

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Susanna Perneby Molin; [2016]
    Nyckelord :fisködlor; embryo; ontogeni; jura; Holzmaden; Earth and Environmental Sciences;

    Sammanfattning : Ichthyosaurs (‘fish lizards’) are a group of marine reptiles that lived during the Mesozoic Era. They are all included in the superorder Ichthyopterygia, which consists of at least 36 genera and 80 species. LÄS MER