Sökning: "trace fossils"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden trace fossils.

  1. 1. The Origins and Ecology of Early Paleozoic Spreiten Ichnofossils: Comparisons of Daedalus and Syringomorpha with Alectorurus

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Zane Goodell; [2023]
    Nyckelord :trace fossils; ichnology; Cambrian; Daedalus desglandi; Alectorurus circinatus; Syringomorpha nilssoni; the agronomic revolution;

    Sammanfattning : The Cambrian explosion not only shaped the ecosystems of the Phanerozoic, but fundamentally changed how biota interacts with the environment, including the substrate. Cambrian trace fossils Alectorurus and Syringomorpha as well as Ordovician-Silurian Daedalus represent novel modes of faunal interaction with the newly innovated shallow marine mixed-ground and have surprisingly limited stratigraphic ranges. LÄS MER

  3. 2. Apan som blev kock

    Kandidat-uppsats, Lunds universitet/Arkeologi

    Författare :Elias Astour; [2019]
    Nyckelord :Fire; early fire sites; Swartkrans; Koobi Fora; Chesowanja; Gadeb; Homo Erectus; History and Archaeology;

    Sammanfattning : How far back in time can we trace fire use in the human story? The archaeological data has demonstrated inconsistency when it comes to answering that question. Incontrovertible remains after hearths are scarce especially before 100,000 years BP. LÄS MER

  4. 3. De mellankambriska oelandicuslagren på Öland : stratigrafi och faciestyper

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Johan Malmgren; [2016]
    Nyckelord :Öland; Sverige; kambrium; trilobiter; Acadoparadoxides oelandicus; Ellipsocephalus polytomus; Earth and Environmental Sciences;

    Sammanfattning : The thesis deals with a drill core retrieved from northern Öland, Sweden, in 2010. The length of the core is c. 107 m and comprises an Ordovician and Cambrian succession. The middle Cambrian primarily consists of fossiliferous mudstone with thin siltstone beds. LÄS MER

  5. 4. Palaeoenvironments of the Earliest (Middle Devonian) Tetrapod Trackways from the Holy Cross Mountains, Poland; Locomotion in a Terrestrial Setting?

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Martin Qvarnström; [2015]
    Nyckelord :Tetrapods; palaeoenvironment; trackways; paleosols; microfacies; trace fossils; fin-limb transition; Holy Cross Mountains.;

    Sammanfattning : The palaeoenvironment from which early tetrapods emerged is crucial to comprehend in order to understand the mechanisms that drove and allowed the terrestrialization of vertebrates; one of the most important evolutionary ‘events’ in the history of animals. Nevertheless, much of the terrestrialization is shrouded in obscurity, inter alia, due to scarcity of early tetrapods in the fossil record. LÄS MER

  7. 5. Determination of dioxins in Cretaceous strata from the South of Sweden. : Can the environmental anthropogenic pollutant dioxin be of natural origin ?

    Magister-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknik

    Författare :Kelly GUILBOT; [2012]
    Nyckelord :old clay layers; octachlorodibenzo-p-dioxin; high resolution gas chromatography-high resolution mass spectrometry; analyzer-isotopic ratio mass spectrometry; isotopic dilution.  ;

    Sammanfattning : Eleven sediment samples from different geological layers and four fossils from the South of Sweden were collected and estimated to be 80 million years old (approximately late of Cretaceous period). The samples were analyzed for polychlorinated dibenzo-p dioxins (PCDD/Fs) to investigate whether these samples are likely to contain dioxins from a natural formation. LÄS MER