Results 171 to 180 of about 2,126 (211)

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
openaire   +1 more source

Clypeolus, A new acritarch genus from the Ordovician and Silurian

Review of Palaeobotany and Palynology, 1997
Clypeolus Miller, Playford et Le Hérissé, gen. nov. is established as a new acritarch genus based on C. tortugaides (Cramer) Miller, Playford et Le Hérissé, comb. nov. et emend. as the type species. The genus incorporates distinctly muronate vesicles that are shield-like or hemispherical and open equatorially, possibly resulting from an undetermined ...
Miller, Merrell A., Playford, Geoffrey, Le Hérissé, Alain   +2 more
openaire   +4 more sources

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).
openaire   +1 more source

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.
openaire   +1 more source

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 ...
openaire   +1 more source

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.
openaire   +1 more source

Acritarchs

2011
Joachim Reitner, Volker Thiel
openaire   +2 more sources

Early Ordovician provincialism in acritarch distribution

Review of Palaeobotany and Palynology, 1997
Abstract Palynological evidence on the distribution of fossil marine microplankton corroborates presumed provincialism during the late Early Ordovician. Closely similar acritarch assemblages and other palynomorphs, namely cryptospores, were recovered from coeval sedimentary sequences within a sedimentary belt rimming the northern margin of Gondwana ...
openaire   +1 more source

Middle–late Cambrian acritarchs of the Zagros Basin, southwestern Iran

Palynology, 2021
Mansour Ghorbani, Thomas Servais, Andrea Sorci   +2 more
exaly  

acritarch, n.

2023
openaire   +1 more source