Search for dissertations about: "Ordovician"

Showing result 16 - 20 of 35 swedish dissertations containing the word Ordovician.

  1. 16. Evolution and ecology of Baltic late Ordovician univalved molluscs

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Jan Ove Rõysi Ebbestad; Uppsala universitet.; [1999]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; Historical Geology and Paleontology; historisk geologi och paleontologi;

    Abstract : Univalved molluscs (Gastropoda and Tergomya) are common fossils in the Palaeozoic succession across Baltoscandia, but most of the more embracive descriptive works on this group appeared before or near the turn of the 19th century. The study presented here aims at revision and description of some Baltoscandian late Ordovician/early Silurian univalved molluscs with emphasis on their shell morphology. READ MORE

  2. 17. Traces in Earth's geological record of the break-up of the L-chondrite parent body 470 Ma

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Carl Alwmark; Lunds universitet.; Lund University.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; L chondrite; Middle Ordovician; extraterrestrial material; meteorite flux; Sweden;

    Abstract : This thesis deals with signatures in sediments on Earth related to the L-chondrite parent body break-up event at 470 Ma. The aim of this thesis is twofold: (1) investigate if the increased flux of extraterrestrial material to Earth, following the disruption of the L-chondrite parent body included larger, asteroid-sized bodies (2) try to develop new methods and tools for finding and classifying relict cosmic material in sediments. READ MORE

  3. 18. Early Ordovician (Volkhov Stage) brachiopod faunas of the East Baltic

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Eva Egerquist; Uppsala universitet.; [2002]
    Keywords : ;

    Abstract : .... READ MORE

  4. 19. Lower Ordovician carbonate sedimentology and lithostratigraphy of northern Öland, Sweden

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Ulf Nordlund; Uppsala universitet.; [1988]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  5. 20. Shipborne geophysical study of an Ordovician-Silurian carbonate platform, Fårö - Hiiumaa area, northeastern Baltic Sea

    University dissertation from Stockholm : Stockholm University

    Author : Igor Tuuling; Stockholms universitet.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Historical Geology and Paleontology; historisk geologi och paleontologi;

    Abstract : The lithological-stratigraphical subdivision, the internal structure and the present relief of the Lower Paleozoic bedrock sequence was investigated by means of high resolution shallow marine seismic reflection profiling in the northeastern Baltic Sea.The Cambrian, as well as the lowermost Silurian layers, show rapidly changing lithologies and thicknesses and provide no trans-Baltic seismic reflectors. READ MORE