Sökning: "Lower Cambrian"

Visar resultat 1 - 5 av 28 uppsatser innehållade orden Lower Cambrian.

  1. 1. Kinematic Enrolment in Four Ordovician Trilobites Using Three-Dimensional Modelling

    Master-uppsats, Uppsala universitet/Paleobiologi

    Författare :Alejandro Corrales Garcia; [2023]
    Nyckelord :3D modelling; Blender; Dysplanus centrotus; enrolment kinematics; Gyrometopus lineatus; Illaenus sarsi; Ordovician; trilobites; Trilobiter; Enrollering; 3D-modellering; Blender; Modelos 3D; Blender; cinematica; enrollamiento; Ordovicico; trilobites;

    Sammanfattning : Trilobites were a successful group of marine arthropods that thrived for much of the Palaeozoic Era. Akey innovation of trilobites involved the capacity to enrol their biomineralized exoskeletons for protection; a trait that appeared early in their evolutionary history during the Cambrian Period. LÄS MER

  3. 2. Parapeytoia yunnanensis: The organism that connects the upper stem-group euarthropods

    Kandidat-uppsats, Uppsala universitet/Paleobiologi

    Författare :Sebastian Axel Cockfield Larsson; [2023]
    Nyckelord :;

    Sammanfattning : The study of euarthropod evolution in the Cambrian is challenging due to controversies surrounding the identification of various anatomical features. Radiodontans are supported to be a monophyletic group to the lower stem of euarthropods. LÄS MER

  4. 3. Polymerized Tubular Silicates in Lower Cambrian Carbonates – Biology or Chemistry?

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Scott Green; [2022]
    Nyckelord :biosignature; tubular structures; Lower Cambrian; silica precipitation; bifurcating; biosignatur; rörstrukturer; Kambrium Serie 3; kiseldioxid utfällning; förgrening;

    Sammanfattning : Shallow marine environments from the Lower Cambrian period were very different to shallow marine environments of today. Tubes of what was thought to be silica recovered from a partly dolomitized carbonate sample collected form a site near Indian Springs, Nevada could help further understand the chemistry and characteristics of such environments. LÄS MER

  5. 4. 3D Geological Modelling of the Subsurface Adjacent to Cementa’s Quarry in Skövde, Sweden

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Minna Larsson; [2022]
    Nyckelord :3D model; limestone; cement production; resistivity; photogrammetry; Skövde; 3D modell; kalksten; cementproduktion; resistivitet; fotogrammetri; Skövde;

    Sammanfattning : Limestone is one of the main components of cement production. Limestone has been quarried in Skövde, Sweden, since the end of 19th century and Cementa AB has been operating the quarry since 1973. Aside from limestone, there are also Alum shale of Cambrian age, mudstones as well as bentonite layers of Ordovician age present in the quarry. LÄS MER

  7. 5. Investigation of Thermal Maturity of  Organic Matter at the Cambro Ordovician Transition in the Zagros Basin, Iran

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Niall Gibbons; [2021]
    Nyckelord :acritarchs; thermal maturity; Zagros Basin; hydrocarbons; source rocks; paleoenvironment;

    Sammanfattning : The thermal maturity of sediments from the upper Cambrian to lower Ordovician Mila and Ilbeyk  formations in the Zagros Basin in southwestern Iran is evaluated in this thesis. A number of low-cost,  fast, optical evaluation methods are utilised to assess their effectiveness for providing accurate, well  constrained thermal maturity results. LÄS MER