Essays about: "ordovicium"

Showing result 21 - 24 of 24 essays containing the word ordovicium.

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

    University essay from Lunds universitet/Geologiska institutionen

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

    Abstract : 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. READ MORE

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

    University essay from Lunds universitet/Geologiska institutionen

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

    Abstract : 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. READ MORE

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

    University essay from Lunds universitet/Geologiska institutionen

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

    Abstract : 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. READ MORE

  5. 24. Late Ordovician communities from North America

    University essay from Lunds universitet/Geologiska institutionen

    Author : Charlotte Ahlgren; [1997]
    Keywords : North America; Cincinnati region; Upper Ordovician; Cincinnatian; fossil communities; palaeoenvironmental reconstructions; Earth and Environmental Sciences;

    Abstract : Sammanfattning: Med utgångspunkt från den fossiliserade hårdvävnaden har paleomiljö och faunor, från sex olika tidpunkter och platser i de överordoviciska lagren i Cincinnati-området (USA), rekonstruerats. Materialet består vanligen av kalksten, men en del lerstens-stuffer förekommer också. READ MORE