Search for dissertations about: "Baltoscandia"

Showing result 1 - 5 of 10 swedish dissertations containing the word Baltoscandia.

  2. 1. Conodont biostratigraphy, taxonomy and palaeoecology in the Darriwilian (Middle Ordovician) of Baltoscandia - with focus on meteorite and extraterrestrial chromite-rich strata

    Author : Johanna Mellgren; Berggrundsgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Conodonts; biostratigraphy; taxonomy; palaeoecology; morphometrics; extraterrestrial chromite; meteorites; Darriwilian; Middle Ordovician; Baltoscandia;

    Abstract : This thesis deals with conodont biostratigraphy and palaeoecology in the Darriwilian (Middle Ordovician) of Baltoscandia, with focus on limestone strata showing traces of the ~ 470 Ma L-chondrite parent body break-up. The evidence for this cosmic event includes abundant centimeter to decimeter-sized fossil meteorites and elevated levels of sediment-dispersed extraterrestrial L-type chromite found in a stratigraphical interval corresponding to the uppermost Lenodus antivariabilis, the L. READ MORE

  4. 2. Early–Middle Ordovician biotic and sedimentary dynamics in the Baltoscandian paleobasin

    Author : Anders Lindskog; Berggrundsgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ordovician; ‘orthoceratite limestone’; carbonate sedimentology; microfacies; paleoecology; paleoenvironment; paleontology; Baltoscandia;

    Abstract : The Baltoscandian region forms part of the paleocontinent Baltica, which was largely covered by a shallow epeiric sea throughout much of the Ordovician (c. 485.5–444 Ma). This ancient sea is today recorded by a thin succession of sedimentary rocks. READ MORE

  5. 3. Middle Cambrian biostratigraphy, fauna and facies in southern Baltoscandia

    Author : Vivianne Berg-Madsen; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  6. 4. Conodont biostratigraphy and diversity in The Lower-Middle Ordovician of Eastern Baltoscandia (St. Petersburg region, Russia) and Kazakhstan

    Author : Tatiana Tolmacheva; Richard Aldrigde; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; Historical Geology and Paleontology; historisk geologi och paleontologi;

    Abstract : Conodonts were first discovered and described by Christian Pander in 1856 from the St. Petersburg region. READ MORE

  7. 5. Middle ordovician conodonts from the Atlantic faunal region and the evolution of key conodont genera

    Author : Jianhua Zhang; Anita Löfgren; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Conodonts; Middle Ordovician; Biostratigraphy and lithofacies; Evolution; Atlantic Faunal Region; Earth sciences; Geovetenskap; allmän och historisk geologi; General and Historical Geology;

    Abstract : This thesis consists of seven separate articles that are mainly concerned with Middle Ordovician conodonts. The studied conodont specimens were obtained from three Middle Ordovician sections in south China and four Middle Ordovician sections in Sweden. READ MORE