Organic‐walled microfossils from the Kistedalen Formation, Norway: acritarch chronostratigraphy of the Baltic Miaolingian and evolutionary trends of placoid acritarchs
Copyright policy )Organic‐walled microfossils from the Kistedalen Formation, Norway: acritarch chronostratigraphy of the Baltic Miaolingian and evolutionary trends of placoid acritarchs
AbstractNew acritarch data from the Kistedalen Formation based on two sections with continuous exposure enable us to establish the most detailed Miaolingian acritarch biozonation in Baltica to date. Six interval zones previously established in Gondwana, theEliasum llaniscum,Cristallinium cambriense,Adara alea,Timofeevia lancarae,Cristallinium dubiumandVulcanisphaera turbatazones, are identified, and their correlations within the Acado‐Baltic Province examined. The diagnoses ofRetisphaeridium,Cristallinium,Retisphaeridium dichamerum,Retisphaeridium lechistanium,Cristallinium dubiumandCristallinium cambrienseare emended and the new speciesRetisphaeridium rugulatumsp. nov. andRetisphaeridium minimumsp. nov. are described. The diagnosis ofRetisphaeridium ovillense(Cramer & Díez) Vanguestaine is emended and the species assigned toDictyotidium ovillensecomb. nov. The main evolutionary changes of the placoid acritarchs during the Miaolingian are analysed. Comparison with previous acritarch data from the Kistedalen Formation suggests that different extraction methodologies may result in significant bias in the recovered fossil record.
- University of California, Santa Barbara United States
- Uppsala University Sweden
- Norwegian Association of Higher Education Institutions Norway
- University of Extremadura Spain
- University of Cape Town South Africa
global correlation, Chronostratigraphy, Acritarch, Acritarco, Evolution, Norway, chronostratigraphy, 590, Geology, Noruega, Evolución, acritarch, Miaolingian, 2417 Biología Vegetal (Botánica), Correlación global, evolution, Cronoestratigrafía, Geologi, Miaolingiense, Global correlation
global correlation, Chronostratigraphy, Acritarch, Acritarco, Evolution, Norway, chronostratigraphy, 590, Geology, Noruega, Evolución, acritarch, Miaolingian, 2417 Biología Vegetal (Botánica), Correlación global, evolution, Cronoestratigrafía, Geologi, Miaolingiense, Global correlation
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