Results 191 to 200 of about 131,389 (234)

Barium in planktonic foraminifera

Geochimica et Cosmochimica Acta, 1991
Abstract Reconstructions of Ba distributions in ancient oceanic surface waters could provide new insight into paleoceanographic change. Calcite shells of planktonic foraminifera potentially provide a means of reconstructing such paleo-Ba distributions if lattice-bound Ba can be determined on shells recovered from deep-sea cores.
David W Lea, Edward A Boyle
openaire   +1 more source

Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera

Journal of Plankton Research, 2019
Diurnal vertical migration (DVM) is a widespread phenomenon in the upper ocean, but it remains unclear to what degree it also involves passively transported micro- and meso-zooplankton.
J. Meilland, M. Siccha, M. Weinkauf, L. Jonkers, R. Morard, U. Baranowski, Adrian Baumeister, Jacqueline Bertlich, G. Brummer, Paul Debray, T. Fritz‐Endres, J. Groeneveld, Leonard Magerl, Philipp Munz, Marina C. Rillo, C. Schmidt, H. Takagi, Gurjit Theara, M. Kučera   +18 more
semanticscholar   +1 more source

Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies

Earth and Planetary Science Letters, 2016
Although boron and uranium to calcium ratios (B/Ca, U/Ca) in planktonic foraminifera have recently received much attention as potential proxies for ocean carbonate chemistry, the extent of a carbonate chemistry control on these ratios remains contentious.
Pallavi Anand
exaly   +2 more sources

Biogeography of planktonic Foraminifera

1999
There are several important unresolved issues in the area of modern planktonic foraminiferal biogeography. The large-scale latitudinally symmetrical faunal provinces do not appear to show a consistent relationship to comparably-scaled hydrographic features.
Anthony J. Arnold, William C. Parker
openaire   +1 more source

Biology of Planktonic Foraminifera

Notes for a Short Course: Studies in Geology, 1982
The history of investigations of planktonic foraminifera leading to their current, wide applications in biostratigraphic correlation of Mesozoic and Cenozoic marine sediments can be traced to the discovery by Owen (1867) of the floating habit of certain foraminifera, later confirmed by Brady (1884), and the recognition by Murray and Renard (1891) that ...
openaire   +1 more source

Planktonic foraminifera in biostratigraphy and biochronology

Newsletters on Stratigraphy
Planktonic foraminifera, single-celled protists, are extensively used in biostratigraphy and biochronology thanks to their abundance in marine sediments, widespread distribution and extensive fossil record in the Cretaceous and Cenozoic. We present an overview of planktonic foraminiferal taxonomy, and evolutionary trends that are relevant to the ...
Petrizzo, Maria Rose, King, David J., Pearson, Paul N., Huber, Brian T., Wade, Bridget S.   +4 more
openaire   +2 more sources

Modern planktonic foraminifera

Geobios, 1989
Christoph Hemleben, Michael Spindler, O. Roger Anderson   +2 more
  +7 more sources

Sedimentation of planktonic foraminifera

Marine Geology, 1971
Fossil assemblages of planktonic Foraminifera contain many valuable clues to paleoclimate and paleo-oceanography. Unfortunately, our understanding of production, dissolution, redeposition, and other processes of foraminiferal sedimentation is but rudimentary.
openaire   +1 more source

Shell Growth and Structure of Planktonic Foraminifera

Science, 1964
Planktonic foraminiferal tests show bilamellar additions to each chamber and develop a "secondary thickening" in the form of a calcite crust in late ontogeny. The evidence presented indicates that additional calcium carbonate is deposited upon the original bilamellar test and that maximum calcite crust thickness is attained at depths greater than 500 ...
A W, Bé, L, Lott
openaire   +2 more sources

Planktonic Foraminifera from the American Oligocene

Science, 1964
Planktonic foraminiferal assemblages from the Vicksburg group of the Gulf Coast region comprise species comparable with those found in the Oligocene of Tanganyika and northern Europe. The fauna is transitional between typical Upper Eocene and Miocene; its intermediate position is indicative of an Oligocene age.
T, Saito, A W, Bé
openaire   +2 more sources