scholarly journals Benthic foraminifera and Neogene sea level changes in the Pelotas Basin, offshore south Brazil

2020 ◽  
Vol 68 ◽  
Author(s):  
Brent Wilson ◽  
João C. Coimbra ◽  
Lee-Ann C. Hayek
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Sea Level Changes ◽  
Pelotas Basin ◽  
South Brazil

Cenozoic Benthic Foraminifera Case Histories of Paleoceanographic and Sea-Level Changes

1982 ◽  
Vol 6 ◽  
pp. 107-126 ◽  
Author(s):  
Kenneth G. Miller
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Deep Sea ◽  
Planktonic Foraminifera ◽  
Environmental Studies ◽  
Sea Level Changes ◽  
Case Histories ◽  
Reasonable Degree ◽  
Near Future ◽  
And Sea Level

Since the inception of their use in commercial micropaleontology, benthic foraminifera have proven to be eminently useful in the solution of geological problems. The utilitarian credentials of benthic foraminifera in estimating paleodepths from marsh through neritic environments with a reasonable degree of accuracy and to indicate approximate ages (viz. subdivision of series/epochs) have been established in both commercial and academic applications. Benthic foraminifera are generally more resistant to dissolution than planktonic foraminifera, and have wide distributions; many taxa have restricted stratlgraphic ranges, making them suitable for correlation and paleo-environmental studies. Yet, three problems have tended to limit the utility of benthic foraminifera: 1) there is a lack of uniformity in taxonomy (Boltovskoy, 1980; Douglas & Woodruff, 1982); 2) attempts to erect zonal schemes using benthic foraminifera have resulted in boundaries which are later proven to be diachronous relative to planktonic zonatlons (e.g. the California provincial stages, Poore, 1976); and 3) attempts to interpret paleodepths from deep-sea benthic foraminifera have produced widely-varying results. One could perhaps conclude, as Boltovskoy (1965a) did over a decade ago, that these problems indicate “…the near future of this science is rather bleak.”

scholarly journals PALEOENVIRONMENTAL RECONSTRUCTION FROM BENTHIC FORAMINIFERAL ASSEMBLAGES OF EARLY HOLOCENE, SHALLOW MARINE DEPOSITS IN GOMBONG, CENTRAL JAVA

2016 ◽  
Vol 22 (1) ◽  
pp. 16
Author(s):  
Luli Gustiantini ◽  
Kresna Tri Dewi ◽  
Anne Muller ◽  
Praptisih Praptisih
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Sea Level Change ◽  
Sea Level Changes ◽  
Shallow Marine ◽  
Marine Deposits ◽  
The Core ◽  
Level Change ◽  
Paleoenvironmental Changes ◽  
Central Java

A 30m-long sediment core covering the Holocene period was taken from the area of Gombong in the southern part of Central Java. The sediments were deposited in a shallow marine to lagoonal environment that was confirmed by the dominance of Ammonia beccarii along the core intervals. In addition, the species Quinqueloculina poeyana, Miliolinella lakemacquariensis, and Miliolinella subrotunda were also found in the sediments that are typical of normal shallow marine conditions. The decrease and increase in the abundance of these species throughout the core is an expression of sea level change in the area, which results the environmental changes. Low sea level is expressed by the dominance of Ammonia beccarii, and the low abundances or absence of the other three species. In contrast, high sea level stands are reflected by the presence of all four species. The high sea level would imply favorable conditions for benthic foraminifera because it would result in normal shallow marine conditions in the area. Finally, from this benthic assemblages study, it can be assumed that the environmental transformation from the originally shallow marine environment into land was occurred at level 5.5m depths of the sediment core, when all benthic foraminifera were terminated, including Ammonia beccarii. These new results from the shallow marine deposits in the Gombong area are a new contribution to the understanding of paleoenvironmental change in the region, which in turn is important for understanding sea level change as well as climate change in the region. Keywords: Benthic foraminifera, Holocene, paleoenvironmental changes, sea level changes Southcoast of Central Java Sebuah percontoh sedimen bor sepanjang 30m yang berumur Holosen diambil dari daerah Gombong, bagian selatan Jawa Tengah. Percontoh sedimen diendapkan pada lingkungan laut dangkal –laguna, berdasarkan kelimpahan foraminifera bentik Ammonia beccarii di sepanjang sedimen bor. Selain itu ditemukan juga spesies-spesies Quinqueloculina poeyana, Miliolinella lakemacquariensis, dan Miliolinella subrotunda, yang merupakan penciri lingkungan laut dangkal dengan kondisi normal. Penurunan dan kenaikan dari kelimpahan masing-masing spesies foraminifera bentik di atas, dapat mencerminkan perubahan permukaan air laut daerah studi, yang menghasilkan terjadinya perubahan lingkungan. Penurunan muka air laut dapat dicirikan dengan hadirnya Ammonia beccarii yang sangat dominan, sementara spesies lainnya cenderung berkurang bahkan hampir tidak ada. Sebaliknya ketika muka air laut naik, maka keempat spesies foraminifera tersebut cenderung hadir dengan jumlah yang seimbang satu sama lainnya. Kenaikan muka air laut akan menghasilkan lingkungan laut normal yang merupakan kondisi ideal bagi foraminifera. Akhirnya, dari kajian perubahan kelimpahan foraminifera bentik ini, dapat diperkirakan bahwa pada level kedalaman bor 5,5m, terjadi perubahan lingkungan dari lingkungan laut dangkal-laguna menjadi daratan, yang ditandai dengan musnahnya semua jenis foraminifera bentik, termasuk Ammonia beccarii. HAsil kajian ini merupakan kontribusi baru untuk mempelajari perubahan lingkungan pada lokasi penelitian, terutama penting untuk lebih mengerti mengenai perubahan muka air laut dan perubahan iklim. Keywords: Benthic foraminifera, Holocene, paleoenvironmental changes, sea level changes

Late Cenozoic sea level changes evidenced by ostracodes in the Pelotas basin, southernmost Brazil

1999 ◽  
Vol 37 (2) ◽  
pp. 117-129 ◽  
Author(s):  
Ana Luisa Carreño ◽  
João Carlos Coimbra ◽  
Dermeval Aparecido Do Carmo
Keyword(s):  
Sea Level ◽  
Late Cenozoic ◽  
Sea Level Changes ◽  
Pelotas Basin

scholarly journals The functional significance of the spinose keel structure of benthic foraminifera: inferences from <i>Miliolina cristata</i> Millett, 1898 (Miliolida) from northeast Romania

2018 ◽  
Vol 37 (1) ◽  
pp. 153-166
Author(s):  
Simina Dumitriţa Dumitriu ◽  
Zofia Dubicka ◽  
Viorel Ionesi
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Functional Significance ◽  
High Energy ◽  
Northwestern Part ◽  
Sea Level Changes ◽  
Thin Sections ◽  
Core Section ◽  
First Time ◽  
Turbulent Water

Abstract. The paper presents Miocene (lower Sarmatian) benthic foraminifera from the FH3P1 Rădăuţi Core section from the northwestern part of the Moldavian Platform, Romania. Based on foraminiferal assemblages we infer sediments were deposited in shallow-water, including marine-marginal environments, of varying salinities from brackish to normal marine with some short and rather small sea-level changes. Moreover, we describe for the first time in the Moldavian Platform a very rare species, Miliolina cristata Millett, which presents a characteristic spinose keel. Based on a detailed study of the test morphology and its variability, observed in picked material as well as in thin sections, we discuss some palaeoecological aspects of these foraminifera. M. cristata probably does not constitute a distinctive species, but it is more probable that some miliolid taxa developed such an exoskeletal feature in response to new environmental conditions, such as more turbulent water. Accordingly, our study would support the thesis that one of the functions of the benthic foraminiferal spines is to stabilize foraminiferal tests found in sandy substrates from high-energy environments.

The major Late Albian transgressive event recorded in the epeiric platform of the Langshan Formation in central Tibet

2019 ◽  
Vol 498 (1) ◽  
pp. 211-232 ◽  
Author(s):  
Yiwei Xu ◽  
Xiumian Hu ◽  
Marcelle K. BouDagher-Fadel ◽  
Gaoyuan Sun ◽  
Wen Lai ◽  
...  
Keyword(s):  
Sea Level ◽  
Marine Environment ◽  
Benthic Foraminifera ◽  
Time Interval ◽  
Sea Level Changes ◽  
Good Opportunity ◽  
Sedimentary Environments ◽  
Polar Ice Sheets ◽  
Global Sea Level ◽  
Central Tibet

AbstractGlobal sea-level changes strongly impact within-basin depositional patterns and the evolution of palaeoclimate, palaeogeography and palaeoecology. During the long, worldwide ice-free period in the mid-Cretaceous greenhouse time interval, high-frequency global sea-level changes were recorded in sedimentary archives. However, the causes of these global sea-level changes are still debated. In central Tibet, the 1 km-thick Langshan Formation has been dated to the late Aptian to early Cenomanian based on larger benthic foraminifera and accumulated in an epeiric seaway, thus, it provides a good opportunity to reconstruct the sea-level change and their controlling factors. Eleven distinct microfacies corresponding to three sedimentary environments have been identified in the Langshan Formation. Calcispheres marlstone and bioclastic wackestone with calcispheres were deposited in an open marine environment; coral rudstone, rudist rudstone and benthic foraminifera–rudist wackestone characterize were deposited in a rudist bank environment; and orbitolinids floatstone–rudstone, green algae packstone, bioclastic grainstone, orbitolinids wackestone with small benthic foraminifera, spicules wackestone and small benthic foraminifera wackestone–mudstone were deposited in a lagoonal environment. The Langshan Formation accumulated on an epeiric platform. This unit documents a sudden deepening event from a rudist bank to an open marine environment during the late Albian (c. 107 Ma). Integrating these findings with regional data from the literature, we infer that this deepening event was a widespread, roughly synchronous feature across the globe, and was controlled by a global sea-level rise related to the decay of polar ice sheets or the release of water from continental aquifers.

Foraminiferal record in a condensed marine succession: a case study from the Albian and Cenomanian (mid-Cretaceous) of Annopol, Poland

2016 ◽  
Vol 154 (3) ◽  
pp. 399-418 ◽  
Author(s):  
ZOFIA DUBICKA ◽  
MARCIN MACHALSKI
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
The Other ◽  
Biological Productivity ◽  
Sea Level Changes ◽  
Marine Deposits ◽  
Sea Level Oscillations ◽  
The One ◽  
Foraminiferal Record

AbstractA condensed succession at Annopol is of key importance for the mid-Cretaceous palaeontology and palaeobiogeography in Poland. Here, the planktonic and benthic foraminifera from the Albian and Cenomanian intervals are studied. The local foraminiferal record is strongly influenced by burrowers. On the one hand, piping down of the foraminiferal tests through burrows disturbed the original succession, for example by introduction of the Cenomanian foraminifera into the Albian phosphorite horizon. On the other hand, the foraminifera in the burrow fills near the base of the Cenomanian provide the sole piece of evidence of a lower upper Cenomanian unit lost from the record by erosion. Changes in foraminiferal assemblages allow for the interpretation of the succession in terms of bathymetry and biological productivity. The highest rate of primary production is deduced for the Albian phosphorite horizon. Integration of foraminiferal and ammonite biostratigraphy with sedimentology allows for the comparison of a pattern of sea-level oscillations recorded at Annopol with the relevant portion of the classic graph of sea-level changes for the British Isles. It turns out that all important elements of the British curve, that is, transgressive peaks and regressive troughs or lows, left their distinctive, albeit highly residual, record in the Annopol succession. This study demonstrates that even extremely condensed marine deposits, such as those at Annopol, may provide a foraminiferal record of better quality, order and resolution than conventionally anticipated.

scholarly journals BENTHIC FORAMINIFERA ASSOCIATED WITH THE ZOOXANTHELLATE CORAL CLADOCORA IN THE PLEISTOCENE OF THE KOS ISLAND (AEGEAN SEA, GREECE): SEA LEVEL CHANGES AND PALAEOENVIRONMENTAL CONDITIONS

2017 ◽  
Vol 43 (2) ◽  
pp. 613 ◽  
Author(s):  
H. Drinia ◽  
Koskeridou E. Koskeridou E. ◽  
Antonarakou A. Antonarakou A. ◽  
E. Tzortzaki
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Aegean Sea ◽  
Sea Level Changes ◽  
Foraminiferal Assemblage ◽  
Environmental Controls ◽  
Strong Current ◽  
Fossil Reef ◽  
Higher Temperature ◽  
Future Work

A Pleistocene section, cropping out in the northern Kos Island has been selected for study. The main lithology (clayey sands, sandy marls) of the section is interrupted by a prominent Cladocora bank which allows a proper extraction of its faunal contents and identification at species level. The evaluation of benthic foraminiferal assemblages from this bank helps to determine the range of the environmental controls in sedimentation. The foraminiferal assemblage is related to a relatively high supply of organic material and rather strong current intensities in water depth of the coral growth. We suggest that the fossil reef of Cladocora grew in coastal waters characterised by a marked seasonality, with periodical inputs of terrigenous sediments, moderate turbidity and higher temperature than today. Such results, although preliminary, suggest that Cladocora together with benthic foraminifera could be reference species for future work on changing Mediterranean climate and sea level.

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