Biostratigraphie der Oberkreide auf Grund von Mikrofossilien

Hiltermann, Heinrich

doi:10.1007/bf03041767

“…The classical perspective on the use in biostratigraphy of the species of Bolivinoides was developed in the fifties and persisted over the next decades. According to it the stratigraphical ranges of the Bolivinoides species were plotted on the succession of stages and used in the definition of assemblage zones (Hiltermann, 1952(Hiltermann, , 1956Hiltermann and Koch, 1955Beckmann and Koch, 1964;Koch, 1977;Schönfeld, 1990, etc.). The potential and actual importance of some species of this genus in biostratigraphy was stressed occasionally, but no definition of biozones was provided within this stream of studies.…”

Section: A Historical Perspective On Methodologymentioning

confidence: 99%

Monographic study of the Late Cretaceous representatives of the bolivinoidid benthic foraminifera

Georgescu¹

2018

Studia UBB Geologia

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Abstract.A high resolution taxonomy and classification framework is developed for the representatives of the calcareous benthic foraminiferal family Bolivinoididae; this family consists of 24 species assigned to three genera. This new classification includes data pertaining of the test ultrastructure, ornamentation and porosity, which are obtained with the aid of careful and extensive study of the specimens under the scanning electron microscope. Two new taxa are described: Bolivinoides antiquum -n. sp. and Swiecickina -n. gen. A biostratigraphical framework consisting of eleven biozones based on bioevents given by species of the genera Bolivinoides and Swiecickina is developed for the middle Santonian-Maastrichtian stratigraphical interval; its resolution is more than double when compared to those of the previously developed biostratigraphical frameworks based on the representatives of this group.

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“…Keeled associations with these features are widespread in northern Europe (Hiltermann 1956(Hiltermann , 1960Jirova 1956;Alexandrowicz 1966), and the western interior of North America (Wall 1967;Kent 1967), areas covered by large, relatively shallow, interior seaways at the time of deposition ( Table 2). Members of the association are also widespread in Tethyan regions, but in the south they are associated with othei taxa, especially Globotruncana fornicata, G. ' r e n d , single keeled forms and rarer elements such as G. concarata.…”

Section: Zoogeographymentioning

confidence: 99%

Cretaceous Planktonic Foraminifera From Bornholm and Their Zoogeographic Significance

Douglas

¹

,

Rankin

²

1969

LET

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Late Cretaceous formations exposed along the south coast of Bornholm Island, Denmark, contain well preserved assemblages of planktonic foraminifera, which are described and illustrated. Two taxa, Whiteinella baltica and Hedbergella bornholmensis, are described as new. The oldest assemblage, Middle to early Upper Cenomanian in age, is essentially monospecific and indicative of a restricted pelagic environment. The overlying Lower Senonian faunules are diverse, contain large populations which are associated with other pelagic microfossils, and provide a more typical example of Boreal planktonic foraminiferal associations. Taxonomically the assemblages are largely composed of species of Hedbergella, Whiteinella, Archaeoglobigerina, Globigerinelloides, and Heterohelix and double‐keeled species of Globotruncana, particularly G. marginata. These species are widely distributed in space and time. Thus Bornholm assemblages have a cosmopolitan aspect, which can be identified in microfaunas from the Western Interior of North America and Alaska. Because of the lower diversity, lack of restricted stratigraphic markers, Lower Senonian correlations between Bornholm, and probably Boreal pelagic microfaunas generally, coeval Tethyan assemblages are less precise than within the Tethys.

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“…The classical perspective on the use in biostratigraphy of the species of Bolivinoides was developed in the fifties and persisted over the next decades. According to it the stratigraphical ranges of the Bolivinoides species were plotted on the succession of stages and used in the definition of assemblage zones (Hiltermann, , 1956Hiltermann and Koch, 1955, 1956Beckmann and Koch, 1964;Koch, 1977;Schönfeld, 1990, etc.). The potential and actual importance of some species of this genus in biostratigraphy was stressed occasionally, but no definition of biozones was provided within this stream of studies.…”

Section: A Historical Perspective On Methodologymentioning

confidence: 99%

Untitled

2018

Studia UBB Geologia

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View full text Add to dashboard Cite

Abstract.A high resolution taxonomy and classification framework is developed for the representatives of the calcareous benthic foraminiferal family Bolivinoididae; this family consists of 24 species assigned to three genera. This new classification includes data pertaining of the test ultrastructure, ornamentation and porosity, which are obtained with the aid of careful and extensive study of the specimens under the scanning electron microscope. Two new taxa are described: Bolivinoides antiquum -n. sp. and Swiecickina -n. gen. A biostratigraphical framework consisting of eleven biozones based on bioevents given by species of the genera Bolivinoides and Swiecickina is developed for the middle Santonian-Maastrichtian stratigraphical interval; its resolution is more than double when compared to those of the previously developed biostratigraphical frameworks based on the representatives of this group.

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Biostratigraphie der Oberkreide auf Grund von Mikrofossilien

Cited by 10 publications

References 7 publications

Monographic study of the Late Cretaceous representatives of the bolivinoidid benthic foraminifera

Monographic study of the Late Cretaceous representatives of the bolivinoidid benthic foraminifera

Cretaceous Planktonic Foraminifera From Bornholm and Their Zoogeographic Significance

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