Results 131 to 140 of about 1,358 (181)

Morphological variability of peteinoid acritarchs from the Middle Ordovician of Öland, Sweden, and implications for acritarch classification

Palynology, 2021
Investigation of large populations of peteinoid acritarchs recovered from Middle Ordovician strata of the Halludden and Horns Udde quarry sections (Oland, Sweden) allows for statistical analyses ba...
Kroeck, David, Eriksson, Mats, Lindskog, Anders, Munnecke, Axel, Dubois, Michel, Régnier, Sylvie, Servais, Thomas   +6 more
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Silurian acritarchs: distribution and trends

Review of Palaeobotany and Palynology, 1974
Abstract Using as point of departure data from hundreds of localities with, essentially, Middle Silurian acritarch assemblages, logical constraints on the composition of these assemblages as they can be inferred from geological information, are discussed.
Fritz H. Cramer, María Del Carmen R. Díez   +1 more
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Fluorescence intensity in Early Cambrian acritarchs from Estonia

Review of Palaeobotany and Palynology, 1998
Fluorescence properties of Early Cambrian acritarchs were investigated using Leica DM IRBE Laser Scanning Confocal Microscopy (LSCM) with a mercury lamp attached.
Talyzina, NM,
exaly   +1 more source

Acritarchs of the Precambrian in mobile zones

Earth-Science Reviews, 1980
Abstract This report lists acritarchs found in the various countries studied for I.G.C.P. Project No. 2. The results are provisional as collecting was not always made in accordance with the adopted rules. The research on the acritarchs from different levels in the Precambrian of the countries studied for I.G.C.P. Project No.
B.V. Timofeyev, G. Choubert, A. Faure-Muret   +2 more
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Acritarchs

Notes for a Short Course: Studies in Geology, 1987
In 1934 the Geological Society of America published its second Memoir: “Paleozoic Plankton of North America,” by Rudolf Ruedemann. This work was concerned primarily with invertebrates, especially the enigmatic and now-extinct graptolites. The primary producers of that era were virtually unknown; accordingly, the author devoted only a few pages to ...
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Neoproterozoic Acritarch Biostratigraphy of China

2020
According to studies of the acritarch biostratigraphy in China, the evolution of Neoproterozoic acritarchs roughly involves four stages, from older to younger, including the pre-Doushantuo Stage, the Doushantuo Stage, the Denying Stage and the Meishucun Stage.
Yin Leiming, Yin Chongyu
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Hystrichophyta and acritarchs

Review of Palaeobotany and Palynology, 1967
Abstract Globular organisms which are found in great abundance in the Posidonia shales of northwestern Germany, have been added to the hystrichosphaerids by Eisenack (1954, 1958), who also included the Tasmanites forms from older formations in this group.
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Some considerations on acritarch classification

Review of Palaeobotany and Palynology, 1996
Abstract Acritarchs are an important group in palynology and especially relevant in lower Palaeozoic sediments. Some 30 years after the group Acritarcha was defined and their systematics examined, their classification should again be debated amongst a wider group of workers.
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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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