Page 154. 9 Benthic Foraminiferal Communities in Oxygen-Depleted Environments of the Louisiana Continental Shelf Emil Platon and Barun K. Sen Gupta Abstract Many species of benthic Foraminifera survive the extreme ...
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The present paper represents a detailed study of the agglutinated of foraminifera Haplophragmoides, Recurvoides, Thalmannammina Plectorecurvoides and Pokornyammina (n. Genus) from the Upper Cretaceous flysch area of the Romanian Eastern... more
The present paper represents a detailed study of the agglutinated of foraminifera Haplophragmoides, Recurvoides, Thalmannammina Plectorecurvoides and Pokornyammina (n. Genus) from the Upper Cretaceous flysch area of the Romanian Eastern Carpathians. Starting from the original diagnosis, the authors carried out the generic and specific taxonmic values of the characters of the studied taxa. There are presented the following genera and species: Haplophragmoides bulloides, H. Decussatus, Recurvoides imperfectus, R. Pseudononioninoides n. Sp., R. Recurvoidiformis, R. Pseudosymetricus, R. Minimus n. Sp. R. Simuloplanus n. Sp. R. Labrospiriformis n. Sp., Thalmannmmina meandertornata, Th. Gerochi, Th. Simpla n. Sp., Plectorecurvoides alternans, Porkornyammina clara n.g.n. Sp.
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— The age of fossil species in samples recovered from a well that penetrates an undisturbed sequence of sedimentary rocks increases with depth. The results of biostratigraphic analy-sis of such a sequence consist of several age-depth... more
— The age of fossil species in samples recovered from a well that penetrates an undisturbed sequence of sedimentary rocks increases with depth. The results of biostratigraphic analy-sis of such a sequence consist of several age-depth values – both known with interval (or fuzzy) uncertainty – and we would like to find, for each possible depth, the interval of the possible values of the corresponding age. A similar problem of bounding an in-tervally (fuzzily) defined function under monotonicity constraint
Sposob zwiniecia komor w skorupkach otwornic z rodziny Plectorecurvoididae Specimens o f Pokornyammina, Thalmannammina (?) and Plectorecurvoid.es were analysed for this study. Taxa with a biserial axis are coiled in the same manner as... more
Sposob zwiniecia komor w skorupkach otwornic z rodziny Plectorecurvoididae Specimens o f Pokornyammina, Thalmannammina (?) and Plectorecurvoid.es were analysed for this study. Taxa with a biserial axis are coiled in the same manner as those with a uniserial axis. In Pokornyammina irregularis (Geroch) the biserial axis can be coiled in a "streptospiral thalmannamminiform" manner or a "streptospiral sensu stricto" manner. The shape of the chamber and the presence of biserial chamber arrangement lead us to believe that Thalmannammina neocomiensis should be transfered to the family Plectorecurvoididae.
Research Interests:
The present paper represents a detailed study of the agglutinated of foraminifera Haplophragmoides, Recurvoides, Thalmannammina Plectorecurvoides and Pokornyammina (n. Genus) from the Upper Cretaceous flysch area of the Romanian Eastern... more
The present paper represents a detailed study of the agglutinated of foraminifera Haplophragmoides, Recurvoides, Thalmannammina Plectorecurvoides and Pokornyammina (n. Genus) from the Upper Cretaceous flysch area of the Romanian Eastern Carpathians. Starting from the original diagnosis, the authors carried out the generic and specific taxonmic values of the characters of the studied taxa. There are presented the following genera and species: Haplophragmoides bulloides, H. Decussatus, Recurvoides imperfectus, R. Pseudononioninoides n. Sp., R. Recurvoidiformis, R. Pseudosymetricus, R. Minimus n. Sp. R. Simuloplanus n. Sp. R. Labrospiriformis n. Sp., Thalmannmmina meandertornata, Th. Gerochi, Th. Simpla n. Sp., Plectorecurvoides alternans, Porkornyammina clara n.g.n. Sp.
Research Interests:
Research Interests:
Page 154. 9 Benthic Foraminiferal Communities in Oxygen-Depleted Environments of the Louisiana Continental Shelf Emil Platon and Barun K. Sen Gupta Abstract Many species of benthic Foraminifera survive the extreme ...
Research Interests:
In paleontology, we know that in each area, the age of a fossil monotonically increases with depth. We have several obser- vations of age and depth { both known with interval uncer- tainty { and we would like to flnd, for each possible... more
In paleontology, we know that in each area, the age of a fossil monotonically increases with depth. We have several obser- vations of age and depth { both known with interval uncer- tainty { and we would like to flnd, for each possible depth, the interval of the possible values of the corresponding age. A similar problem of bounding an intervally deflned function under monotonicity constraint occurs in many other appli- cation areas. In this paper, we provide an e-cient algorithm for solving this problem.
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Research Interests: Evolutionary Biology, Environmental Science, Geology, Oceanography, Ecology, and 15 moreStratification, Eutrophication, Benthic foraminifera, Seasonality, Marine, Foraminifera, Nitrogen, Mississippi River, Species Distribution, Continental shelf, Gulf of Mexico, Marine Micropaleontology, Water Depth, present day, and Principal Component Analyses (PCA)
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The age of fossil species in samples recovered from a well that penetrates an undisturbed sequence of sedimentary rocks increases with depth. The results of biostratigraphic analysis of such a sequence consist of several age-depth values... more
The age of fossil species in samples recovered from a well that penetrates an undisturbed sequence of sedimentary rocks increases with depth. The results of biostratigraphic analysis of such a sequence consist of several age-depth values - both known with interval (or fuzzy) uncertainty - and we would like to find, for each possible depth, the interval of the possible
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We examined a suite of paleoindicators in 210Pb‐dated sediment cores to determine the historical course of primary production, eutrophication, and oxygen stress in the coastal ocean adjacent to the plumes of the Mississippi and... more
We examined a suite of paleoindicators in 210Pb‐dated sediment cores to determine the historical course of primary production, eutrophication, and oxygen stress in the coastal ocean adjacent to the plumes of the Mississippi and Atchafalaya rivers. The assumption that hypoxia is a natural feature of the coastal ecosystem in the northern Gulf of Mexico influenced by the discharge of the Mississippi River system is not supported by paleoindicators in accumulated sediments. There is a propensity for the ecosystem to develop hypoxia because of the high discharge of the Mississippi River and physical dynamics on the continental shelf that support stratification. However, paleoindicators of eutrophication and oxygen conditions record recent anthropogenic influences. The evidence for increased carbon production and accumulation comes from diatoms and their remnants, marine‐origin carbon in the sediments, and phytoplankton pigments. Surrogates for oxygen condition, including mineral, isotopi...
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Executive Summary EGI proposes a multi-phase, paleoecologic research study of the deep water microfossils initially focused on improved paleobathymetric zonation of Neogene and Recent benthic foraminifera for the purpose of better... more
Executive Summary EGI proposes a multi-phase, paleoecologic research study of the deep water microfossils initially focused on improved paleobathymetric zonation of Neogene and Recent benthic foraminifera for the purpose of better understanding of deep sea ...
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On the northern Gulf of Mexico slope, foraminiferal communities in surface sediments associated with methane-hydrate dissociation exhibit a reduced species diversity (compared to the diversity in isobathyal, non-seep sediments from the... more
On the northern Gulf of Mexico slope, foraminiferal communities in surface sediments associated with methane-hydrate dissociation exhibit a reduced species diversity (compared to the diversity in isobathyal, non-seep sediments from the same general area) and a conspicuous presence of microaerophilic species. These methane-tolerant species of Foraminifera, unlike some macroinvertebrates, are not endemic to cold seeps, but represent a part of the background community. A push core (JSL2900-PC2), taken from a ...
Anomalously negative d 13 C excursions in fossil benthic foraminifera tests coinciding with rapid climate changes were used as the smoking gun of hydrate-sourced methane released into the atmosphere. Although highly desirable, the effects... more
Anomalously negative d 13 C excursions in fossil benthic foraminifera tests coinciding with rapid climate changes were used as the smoking gun of hydrate-sourced methane released into the atmosphere. Although highly desirable, the effects of methane hydrate dissociation on stable isotopes of recent benthic foraminifera have not yet been tested. Here we present carbon and oxygen isotope records of benthic foraminifera species Bolivina ordinaria and B. albatrossi associated with methane hydrates which have important implications regarding ...
This article aims to provide a simple and applicable method of measuring the rock accumulation rate and recording the depositional events based on the application of graphic correlation and similarity matrix of the Paleogene planktonic... more
This article aims to provide a simple and applicable method of measuring the rock accumulation rate and recording the depositional events based on the application of graphic correlation and similarity matrix of the Paleogene planktonic foraminifera in two surface sections in South Sinai. Fifteen continuous biozones and subzones were recorded spanning from P0 to E3. The average RAR of the Beida Formation was somewhat equal to that recorded for the Dakhla Formation, however, the Selandian‐Ypresian Garra Formation was more than twice that recorded for the Esna Formation. On the other hand, the Thebes Formation represents a reverse setting which is relatively higher in the south than the north. Seven (T1‐T7) and twelve (T1‐T12) terraces were recorded at different stratigraphic positions. The terraces diverged in the Palaeocene and converged in the Eocene, whereas they lengthen in the Palaeocene and shortened in the Eocene. Breaks identified in the SM support many of the poorly constrain...