Results 181 to 190 of about 3,600 (212)

Tremadocian acritarchs from northwestern Argentina

Review of Palaeobotany and Palynology, 1997
Abstract A Tremadocian acritarch assemblage is described from the Santa Rosita Formation, Cordillera Oriental, Salta Province, northwestern Argentina. The microplankton corresponds to trilobite-bearing strata assigned to the lower to upper Tremadocian from the middle part of the Santa Rosita Formation.
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The Ordovician acritarch Frankea:Some critical remarks

Geobios, 1997
Abstract The taxonomy of the acritarch genus Frankea Burmann , 1970 is clarified. Five species belong to thegenus: breviuscula, hamata, hamulata, longiuscula and sartbernardensis . Intraspecific variability is great, and it is difficult to distinguish the species sartbernardensis, breviuscula and longiuscula , which show a gradual increase
Oldrich Fatka, Stewart G. Molyneux, Thomas Servais   +2 more
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Early Cambrian acritarchs from Scandinavia and Poland

Palynology, 1988
Abstract Two species of Early Cambrian acritarchs previously referred to Baltisphaeridium — B. brachyspinosum Kirjanov 1974, and B. papillosum (Timofeev) Volkova 1968 — are transferred to Comasphaeridium Staplin et al. 1965. The new species C. molliculum sp. nov.
Małgorzata Moczydłowska, Gonzalo Vidal
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The Ordovician Arkonia-Striatotheca acritarch plexus

Review of Palaeobotany and Palynology, 1997
Abstract The original diagnoses, stratigraphical ranges and geographical distribution of all infrageneric taxa attributed to the genera Arkonia Burmann 1970 and Striatotheca Burmann 1970, are critically evaluated in a review of published literature supplemented by studies of new material from Belgium and Germany, including sections from type ...
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New Lower Cambrian acritarchs from Poland

Review of Palaeobotany and Palynology, 1988
Abstract Six new acritarch taxa are described from Lower Cambrian deposits in the Lublin Slope of the East European Platform in southeastern Poland. Four of them, Comasphaeridium agglutinatum n.sp., Comasphaeridium formosum n.sp., Comasphaeridium velvetum n.sp. and Pterospermella velata n.sp.
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Acritarchs in carbonaceous meteorites and terrestrial rocks

SPIE Proceedings, 2013
Acritarchs are a group of organic-walled, acid-resistant microfossils of uncertain or unknown origin. Some are thought to represent the cysts or resting stages of unicellular protists (possibly dinoflagellates), chrysophytes (green algae) or other planktonic eukaryotic algae.
Alexei Y. Rozanov, Richard B. Hoover
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Lower Cambrian acritarch stratigraphy in Scandinavia

Geologiska Föreningen i Stockholm Förhandlingar, 1981
Acritarchs are reported from units of the basal Cambrian sequences in Denmark (Bornholm), southern Sweden (Scania and Vastergotland), and southern Norway (Lake Mjosa area).
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Variability in the Ordovician acritarch Dicrodiacrodium

1996
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Servais, Thomas, Brocke, Rainer, Fatka, Olda   +2 more
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British Cambrian acritarchs — A preliminary account

Review of Palaeobotany and Palynology, 1974
Abstract A brief characterization of acritarch assemblages from sequences of known Cambrian age is presented. Cambrian acritarch assemblages have great potential for zonation and long-range correlations.
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Acritarchs from the Dadas Formationin Southeast Turkey

Geobios, 1979
Abstract Dadas Formation in Southeast Turkey yields abundant well preserved acritarchs, chitinozoans, tasmanites and scolecodonts. Encountered acritarchs suggest Upper Llandoverian-Ludlovian age for this formation. The acritarch association of the Dadas Formation resembles to the Middle Silurian assemblages of Tunisia and Libya. Thus Southeast Turkey
Ugr Erkmen, Nihat Bozdoǧan
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