Sökning: "biostratigraphy"

Visar resultat 1 - 5 av 20 uppsatser innehållade ordet biostratigraphy.

  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. The Biogeographical Extent and Global Synchronicity of the Late Miocene Reticulofenestra pseudoumbilicus Paracme

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Joseph Asanbe; [2022]
    Nyckelord :late Miocene; biogenic bloom; nannofossil biostratigraphy; paleo-productivity; Reticulofenestra size variation;

    Sammanfattning : Previous biostratigraphic studies in the Indian Ocean, equatorial Pacific, Atlantic Ocean and the Caribbean Sea document the temporal disappearance of Reticulofenestra pseudoumbilicus in the late Miocene (Tortonian age). This interval has been subsequently defined as the R. pseudoumbilicus paracme. LÄS MER

  4. 3. Distribution of Sabellidites (Annelida?) in the Basal Cambrian of the Digermulen Peninsula, Arctic Norway

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Frida Hybertsen; [2017]
    Nyckelord :Ediacaran; Cambrian; Sabellidites; biostratigraphy; Digermulen Peninsula; Arctic Norway; Ediacara; kambrium; Sabellidites; biostratigrafi; Digermulen;

    Sammanfattning : The Digermulen Peninsula, Arctic Norway, offers a unique section of late Ediacaran to Cambrian sediments in an almost complete succession within the Vestertana Group. The proposed annelidan fossil Sabellidites cambriensis is found here, within the Lower Breidvika Member and is believed to exist also in the underlying Manndrapselva Member of the Stáhpogieddi Formation. LÄS MER

  5. 4. 100 år av miljöförändringar som de registrerats i Hallsfjärden, västra Östersjön : En biostratigrafisk studie om vad bevarade kiselalger i sediment kan berätta om tidigare miljöförhållande i Hallsfjärden.

    Kandidat-uppsats, Södertörns högskola/Miljövetenskap

    Författare :Elinor Nilsson; Therese Nordin; [2016]
    Nyckelord :treatment plant; sediment core; Himmerfjärden; Himmerfjärdsverket; diatom analysis; Södertälje; Stockholm archipelago; reningsverk; sedimentkärna; Himmerfjärden; Himmerfjärdsverket; diatoméanalys; Södertälje; Stockholms skärgård;

    Sammanfattning : Diatoms are microscopic, photosynthetic, single-celled organisms that are useful in studies of water qualities (eg pH, nutrients, salinity). By analyzing changes in the species composition of diatoms back in time, gives an opportunity to interpret the marine environment affected by various factors (Andren et al, 1999). LÄS MER

  7. 5. Cambrian stratigraphy and depositional dynamics based on the Tomten-1 drill core, Falbygden, Västergötland, Sweden

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Frans Lundberg; [2016]
    Nyckelord :biostratigraphy; Sweden; Västergötland; drill core; agnostoids; trilobites; δ13 excursion DICE ; Cambrian; carbon isotope stratigraphy; Earth and Environmental Sciences;

    Sammanfattning : The Tomten-1 drilling at Torbjörntorp in Västergötland, southern Sweden, penetrated 29.85 m of Cambrian Series 2 and 3, Furongian, and Lower and Middle Ordovician strata. The biostratigraphy, sedimentology and carbon isotope (δ[sup]13[/sup]C[sub]org[/sub]) stratigraphy of the core have been analysed. LÄS MER