Sökning: "Arenig"

Hittade 4 uppsatser innehållade ordet Arenig.

1. 1. Phosphatized echinoderm remains from upper Lower Ordovician strata of northern Öland, Sweden : preservation, taxonomy and evolution

   Magister-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Magnus Svensson; [1999]
   Nyckelord :Echinodermata; Lower Ordovician; phosphatization; Gillberga; Öland; Sweden; stereom; Stylophora; Asterozoa; Crinozoa; Echinozoa; Cyclocystoidiea; Palaeozoic fauna; Earth and Environmental Sciences;

   Sammanfattning : Phosphatization of late Early Ordovician echinoderm fragments from N Öland has resulted in excellent preservation of the echinoderm stereom ultra structure. The stereom investigated shows a close relationship to different types found in recent echinoderms. LÄS MER

3. 2. Conodont biostratigraphy in Volkhovian sediments from the Mäekalda section, north-central Estonia

   Magister-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Jenny Wickström; [1999]
   Nyckelord :Conodonts; biostratigraphy; Baltoniodus navis Zone; Paroistodus originalis Zone; Baltoniodus norrlandicus Zone; Toila Formation; Volkhov; Arenig; Ordovician; Mäekalda; Estonia; Earth and Environmental Sciences;

   Sammanfattning : This investigation examines the distribution of conodont elements in the upper Lower Ordovician (Arenig) Volkhov Stage of the Mäekalda section situated in the Tallinn area, north-central Estonia. Slightly more than 36,000 conodont elements from 18 samples were investigated, and the biostratigraphic result was compared to previous works on conodont biostratigraphy from localities in south-central Sweden. LÄS MER

4. 3. Lower Ordovician conodonts from Köpings klint, central Öland, and the feeding apparatuses of Oistodus lanceolatus Pander and Acodus deltatus Lindström

   Magister-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Jonas B. Ahnesjö; [1998]
   Nyckelord :Conodonts; Lower Ordovician; Tremadoc; Arenig; biostratigraphy; Öland; Sweden; feeding apparatus; Acodus deltatus; Oistodus lanceolatus; provincialism; facies indicators; Earth and Environmental Sciences;

   Sammanfattning : Köpings klint is located on Öland, SE Sweden and expose a sequence of Lower Ordovician rocks from the boundary between the Tremadoc and the Arenig. The strata are correlated with the Paltodus deltifer, the Paroistodus proteus and the Oepikodus evae conodont Zones. LÄS MER

5. 4. En biostratigrafisk undersökning av conodontfaunan i Limbatakalkstenen på lokalen "Stenbrottet" i Västergötland

   Magister-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Arne Persson; [1988]
   Nyckelord :geography; geology; conodonts; biostratigraphy; lower Ordovician; Arenig; Limbata-beds; Stenbrottet quarry; Västergötland; Earth and Environmental Sciences;

   Sammanfattning : The conodont fauna recovered from the Arenig strata of the "Stenbrottet" quarry represents two biozones, i. e. the underlying Baltoniodus triangularis/B. navis Zone and above, the Paroistodus originalis Zone. LÄS MER