Terrestrial influence as a key driver of spatial variability in large benthic foraminiferal assemblage composition in the Central Indo-Pacific

Site U1512 was drilled during Expedition 369 of the International Ocean Discovery Program (IODP), which is located in the Great Australian Bight, southern Indian Ocean. It provides exceptional insights into the benthic foraminiferal biostratigraphy and paleoecology of a high southern latitude restricted marginal marine basin during the Late Cretaceous hot greenhouse climate and the rifting between Australia and Antarctica. The sedimentary sequence recovered at Site U1512 presents a rare record of a deep water agglutinated foraminifera (DWAF) community from the Southern High Latitudes. The Cretaceous record at Site U1512 covers the lower Turonian through Santonian (nannofossil zones UC8b to UC12/CC10b to CC16, H. helvetica to Marginotruncana spp. - Planoheterohelix papula - Globotruncana linneana planktonic foraminifera zones). Diverse benthic foraminiferal assemblages yield many new taxa that are yet to be described.Agglutinated forms dominate the assemblage in most intervals. In lower to mid Turonian and Santonian strata, calcareous benthic as well as planktonic foraminifera are frequent. Abundant radiolaria are recovered from the mid Turonian, and they increase up-section and exceed 50% of the microfossil assemblage. We documented a diverse benthic foraminiferal assemblage consisting of 162 taxa (110 agglutinated and 52 calcareous). The most common taxa of the DWAF assemblage are tubular (i.e., Kalamopsis grzybowskii, Bathysiphon spp.) and planispiral forms (i.e., Ammodiscus spp., Haplophragmoides spp., Buzasina sp., Labrospira spp.).The Turonian strata yield highly abundant Bulbobaculites problematicus and Spiroplectammina navarroana. The presence of the agglutinated foraminiferal marker taxa Uvigerinammina jankoi and Bulbobaculites problematicus provides a tie-point to the Tethyan DWAF biozonation of Geroch and Nowak (1984). The composition of foraminiferal assemblages and the increase in radiolaria abundance suggest unstable environmental conditions at Site U1512 during the early Turonian through Santonian. These characteristics refer to changes in bathymetry associated with changing ocean chemistry. Results of quantitative analyses of the benthic foraminiferal assemblages indicate a restricted paleoenvironmental regime, dictated by changes in paleobathymetry, unstable patterns in ocean circulation, and the discharge of a nearby river delta system.References: Geroch, S., Nowak, K., 1984. Proposal of zonation for the Late Tithonian &#8211; late Eocene. based upon arenaceous Foraminifera from the Outer Carpathians, Poland, 225-239, In: Oertli, H.J. (Ed.), Benthos &#180;83; 2nd international 915 Symposium on Benthic Foraminifera, Pau (France) April 11-15, 1983, Elf Aquitaine, ESO REP and TOTAL CFP, Pau and Bordeaux.&#160;

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Nummulites Fayumensis N. Sp. and Nummulites Tenuissimus N. Sp. from Munquar El-rayan, Fayum, Egypt

The Journal of Foraminiferal Research ◽

10.2113/gsjfr.48.1.17 ◽

2018 ◽

Vol 48 (1) ◽

pp. 17-28 ◽

Cited By ~ 1

Author(s):

Safia Al Menoufy ◽

Mohamed Boukhary

Keyword(s):

New Species ◽

Foraminiferal Assemblage ◽

Shallow Marine ◽

Marine Facies ◽

Benthic Foraminiferal Assemblage ◽

Insight Into ◽

Important Site

Abstract Nummulites fayumensis n. sp. and Nummulites tenuissimus n. sp. are described from the Munqar El-Rayan Section, Fayum, Egypt. Nummulites tenuissimus belongs to the N. partschi group, while N. fayumensis belongs to the N. gizehensis group, based on diameter and protoconch sizes, septal shape and granulations. Both new species are of Lutetian age, assigned to SBZ14/15, and encountered in shallow-marine facies. Wadi El-Rayan is an important site for vertebrate fossils in Egypt and the abundant larger benthic foraminiferal assemblage provides insight into paleoenvironmental parameters associated with the deposition of Eocene-age rock units of the Munqar El-Rayan Section.

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The Late Cretaceous–Early Paleocene palaeobathymetric trends in the southwestern Barents Sea — Palaeoenvironmental implications of benthic foraminiferal assemblage analysis

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2011.04.021 ◽

2011 ◽

Vol 307 (1-4) ◽

pp. 44-58 ◽

Cited By ~ 27

Author(s):

Eiichi Setoyama ◽

Michael A. Kaminski ◽

Jarosław Tyszka

Keyword(s):

Late Cretaceous ◽

Barents Sea ◽

Foraminiferal Assemblage ◽

Early Paleocene ◽

Assemblage Analysis ◽

Benthic Foraminiferal Assemblage

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Benthic foraminiferal assemblage of Seogwipo Formation in Jeju Island, South Sea of Korea: Implication for late Pliocene to early Pleistocene cold episode in the northwestern Pacific margin

Quaternary International ◽

10.1016/j.quaint.2010.04.009 ◽

2010 ◽

Vol 225 (1) ◽

pp. 138-146 ◽

Cited By ~ 9

Author(s):

Sora Kang ◽

Dhongil Lim ◽

So-Young Kim

Keyword(s):

Jeju Island ◽

Early Pleistocene ◽

Northwestern Pacific ◽

Foraminiferal Assemblage ◽

Late Pliocene ◽

South Sea ◽

Pacific Margin ◽

Cold Episode ◽

Benthic Foraminiferal Assemblage ◽

Seogwipo Formation

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Repeated bottom-water oxygenation during OAE 2: timing and duration of short-lived benthic foraminiferal repopulation events (Wunstorf, northern Germany)

Journal of Micropalaeontology ◽

10.1144/0262-821x11-011 ◽

2011 ◽

Vol 30 (2) ◽

pp. 119-128 ◽

Cited By ~ 6

Author(s):

Oliver Friedrich ◽

Silke Voigt ◽

Tanja Kuhnt ◽

Mirjam C. Koch

Keyword(s):

Bottom Water ◽

Elemental Concentration ◽

Water Environment ◽

Source Area ◽

Black Shales ◽

Northern Germany ◽

Short Term ◽

Lower Saxony ◽

Foraminiferal Assemblage ◽

Benthic Foraminiferal Assemblage

Abstract. Published proxy data for Oceanic Anoxic Event 2 (OAE 2 or Cenomanian–Turonian Boundary Event) and other mid-Cretaceous OAEs indicate widespread anoxic bottom-water conditions. However, increasing evidence shows that anoxia was not permanent but subject to significant fluctuations. We have generated X-ray fluorescence elemental concentration and benthic foraminiferal assemblage records for a short section of OAE 2 black shales from Wunstorf, northern Germany. Two intervals of low sulphur elemental concentration are interpreted as periods of increased oxygenation of bottom waters. This is supported by benthic foraminiferal assemblage data showing repopulation events associated with these intervals. These repopulation events are characterized mainly by the occurrence of agglutinated taxa, with Lingulogavelinella globosa being the only abundant calcareous species. This observation is interpreted in terms of short-term interruptions of the otherwise anoxic bottom-water environment. Comparison with repopulation events during OAE 1b and Quaternary sapropels make it reasonable to speculate that short-term cooling and an associated increase in bottom-water ventilation at the NW European shelf sea are the main trigger mechanisms for the observed repopulation events at Wunstorf. As source area for benthic foraminifera, shallower parts of the Lower Saxony basin are proposed.

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Els macroforaminífers i la fauna associada del Maastrichtià del sector Prebètic valencià sud (Est de la Península Ibèrica)

Treballs del Museu de Geologia de Barcelona ◽

10.32800/tmgb.2018.24.0055 ◽

2019 ◽

pp. 55-76

Author(s):

P. Granero ◽

R. Robles-Salcedo ◽

G. Lucena ◽

L. Troya ◽

V. Vicedo

Keyword(s):

Iberian Peninsula ◽

Upper Cretaceous ◽

Larger Foraminifera ◽

Associated Fauna ◽

Foraminiferal Assemblage ◽

Foraminiferal Species ◽

Benthic Foraminiferal Assemblage ◽

First Time ◽

Península Ibérica ◽

Cretaceous Deposits

Larger foraminifera and associated fauna from the Maastrichtian of the southern valencian Prebaetic sector (E Iberian Peninsula) The benthic foraminiferal assemblage and the associated fauna found in the Upper Cretaceous deposits of the Serra de la Solana, Valencia (Spain) have been revised. The study has allowed us to confirm the presence of the foraminiferal species Hellenocyclina beotica Reichel, Siderolites aff. calcitrapoides Lamarck, Orbitoides apiculata Schlumberger, Orbitoides gensacicus (Leymerie) and Omphalocyclus macroporus (Lamarck), as stated by previous authors. In addition, the revision has permitted to identify some other species, never cited before in Serra de la Solana and neighbour regions in Iberian Peninsula, such as Fissoelphidium operculiferum Smout and Selimina cf. spinalis Inan and two different morphotypes of rotaliids that we have left in open nomenclature, namely, Rotaliidae indet. sp. 1 and Rotaliidae indet. sp. 2. The rudists and echinoid found associated to these benthic foraminifera have been also revised. The rudist species found are Hippurites radiosus Des Moulins, Hippurites cornucopiae Defrance, Hippurites cf. lamarcki Douvillé, and Apricardia sp., the two latter cited in Serra de la Solana for the first time. The echinoid assemblage is composed of the species Pygopyrina darderi (Lambert), Linthia payeni (Coquand) and Hemipneustes striatoradiatus (Leske). The whole assemblage, typical of shallow-water platform environments, is Upper Maastrichtian in age and shows some differences in respect other contemporaneous asseblages from other paleogeographical areas.

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