Two bryozoan assemblages from the Ordovician of the Russian Arctic
| Autor: | Andrej Ernst, Alexander P. Gubanov, Olga K. Bogolepova |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
biology
Fauna Paleontology Geology 06 humanities and the arts 010502 geochemistry & geophysics 0603 philosophy ethics and religion biology.organism_classification 01 natural sciences The arctic Single species Arctic 060302 philosophy Paleoecology Ordovician Bryozoa Taxonomy (biology) 0105 earth and related environmental sciences |
| Zdroj: | GFF. 139:205-215 |
| ISSN: | 2000-0863 1103-5897 |
| DOI: | 10.1080/11035897.2017.1319877 |
| Popis: | Two assemblages from the Ordovician rocks of the Arctic region contain exclusively trepostome bryozoans. The first assemblage from the Yunoyaga Formation (Middle Ordovician) of Maly Oleniy Island, Novaya Zemlya, contains Monticulipora mammulata d’Orbigny, 1850 and Nicholsonella vaupeliformis Modzalevskaya, 1955. Both species possess thick-branched ramose colonies characteristic for rather high energy environments. The second assemblage comes from two localities of the Stroinaya Formation (Upper Ordovician) of the October Revolution Island containing the single species Amplexopora angusta Astrova, 1965. The monospecific bryozoan fauna of branched, rarely encrusting growth forms and sedimentological characteristics of embedding rocks (floatstone) suggest low energy conditions in deeper environments, apparently accompanied by high salinity conditions. |
| Databáze: | OpenAIRE |
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