Results 171 to 180 of about 3,600 (212)
The great catastrophe: causes of the Permo-Triassic marine mass extinction. [PDF]
Wignall PB, Bond DPG.
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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 +6 more
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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 +6 more
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Silurian acritarchs: distribution and trends
Review of Palaeobotany and Palynology, 1974Abstract 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 +1 more
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Morphologic Variability In Lower Palaeozoic Acritarchs: Importance For Acritarch Systematics
2008Fatka, Oldřich, Brocke, Rainer (2008): Morphologic Variability In Lower Palaeozoic Acritarchs: Importance For Acritarch Systematics.
Fatka, Oldřich, Brocke, Rainer
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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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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
2020According 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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Chapter 9.1 Neoproterozoic Acritarch Evolution
2009Acritarchs are key for unravelling Neoproterozoic biodiversity changes because they represent the only fossil group occurring throughout the era. Their Neoproterozoic evolution is characterised by drastic diversity changes, which, coupled to the occurrence of taxa with restricted stratigraphic range, represents a powerful biostratigraphic tool for the ...
Claudio Gaucher, Peter Sprechmann
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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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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, 1996Abstract 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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