Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673
Five species of Bolboforma have been found in middle Eocene to lower Oligocene sediments from Maud Rise, Weddel Sea, Antarctica (Leg 113, Holes 689B and 690B), the first reported Bolboforma from the Antarctic Paleogene. The previous oldest known occurrences of Bolboforma in the world's oceans w...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
PANGAEA - Data Publisher for Earth & Environmental Science
1990
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.753324 https://doi.pangaea.de/10.1594/PANGAEA.753324 |
id |
ftdatacite:10.1594/pangaea.753324 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.1594/pangaea.753324 2023-05-15T13:46:22+02:00 Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 Kennett, Diana M Kennett, James P 1990 application/zip https://dx.doi.org/10.1594/pangaea.753324 https://doi.pangaea.de/10.1594/PANGAEA.753324 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/odp.proc.sr.113.208.1990 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg113 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 1990 ftdatacite https://doi.org/10.1594/pangaea.753324 https://doi.org/10.2973/odp.proc.sr.113.208.1990 2022-02-08T16:02:21Z Five species of Bolboforma have been found in middle Eocene to lower Oligocene sediments from Maud Rise, Weddel Sea, Antarctica (Leg 113, Holes 689B and 690B), the first reported Bolboforma from the Antarctic Paleogene. The previous oldest known occurrences of Bolboforma in the world's oceans were of late Eocene age and this study extends the known range to the middle middle Eocene (~ 44 Ma). Highest species diversity of Bolboforma in the Weddell Sea region of Antarctica occurred during the late Eocene, after which all but one important species disappeared before the Eocene/Oligocene boundary (36.5 Ma). The remaining species, B. irregularis, disappeared soon after, during the earliest Oligocene. The disappearance of Bolboforma in this region of Antarctica coincided with significant climatic cooling that occurred at the end of the Eocene and during the earliest Oligocene, when subpolar replaced temperate conditions. Bolboforma is not known from younger sediments in the Antarctic except for a brief interval during the late early Miocene, an interval of Neogene climatic warmth. The presence of Bolboforma in Eocene to lower Oligocene sequences in the Weddell Sea region of Antarctica is therefore consistent with this taxon's previously recognized association with temperate water masses. Bolboforma is of limited biostratigraphic value at present, because of relatively long stratigraphic ranges and diachronous extinctions. Previous suggestions that Bolboforma represents an encystment stage of phytoplankton require further critical study because the deposition, in large numbers, at paleodepths up to 2250 m in the open ocean, is an unlikely strategy for an encystment phase of a phytoplanktonic organism. A new species, Bolboforma antarctica, is described, exhibiting a stratigraphic range from middle middle Eocene to the upper Eocene (~ 44 to 39 Ma). Article in Journal/Newspaper Antarc* Antarctic Antarctica Weddel Sea Weddell Sea DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic Weddell Sea Weddell Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg113 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg113 Joides Resolution Ocean Drilling Program ODP Kennett, Diana M Kennett, James P Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
topic_facet |
Drilling/drill rig Leg113 Joides Resolution Ocean Drilling Program ODP |
description |
Five species of Bolboforma have been found in middle Eocene to lower Oligocene sediments from Maud Rise, Weddel Sea, Antarctica (Leg 113, Holes 689B and 690B), the first reported Bolboforma from the Antarctic Paleogene. The previous oldest known occurrences of Bolboforma in the world's oceans were of late Eocene age and this study extends the known range to the middle middle Eocene (~ 44 Ma). Highest species diversity of Bolboforma in the Weddell Sea region of Antarctica occurred during the late Eocene, after which all but one important species disappeared before the Eocene/Oligocene boundary (36.5 Ma). The remaining species, B. irregularis, disappeared soon after, during the earliest Oligocene. The disappearance of Bolboforma in this region of Antarctica coincided with significant climatic cooling that occurred at the end of the Eocene and during the earliest Oligocene, when subpolar replaced temperate conditions. Bolboforma is not known from younger sediments in the Antarctic except for a brief interval during the late early Miocene, an interval of Neogene climatic warmth. The presence of Bolboforma in Eocene to lower Oligocene sequences in the Weddell Sea region of Antarctica is therefore consistent with this taxon's previously recognized association with temperate water masses. Bolboforma is of limited biostratigraphic value at present, because of relatively long stratigraphic ranges and diachronous extinctions. Previous suggestions that Bolboforma represents an encystment stage of phytoplankton require further critical study because the deposition, in large numbers, at paleodepths up to 2250 m in the open ocean, is an unlikely strategy for an encystment phase of a phytoplanktonic organism. A new species, Bolboforma antarctica, is described, exhibiting a stratigraphic range from middle middle Eocene to the upper Eocene (~ 44 to 39 Ma). |
format |
Article in Journal/Newspaper |
author |
Kennett, Diana M Kennett, James P |
author_facet |
Kennett, Diana M Kennett, James P |
author_sort |
Kennett, Diana M |
title |
Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
title_short |
Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
title_full |
Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
title_fullStr |
Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
title_full_unstemmed |
Bolboforma of Eocene and lower Oligocene sediments of Maud Rise, Weddell Sea, supplement to: Kennett, Diana M; Kennett, James P (1990): Bolboforma Daniels and Spiegler, from Eocene and lower Oligocene sediments, Maud Rise, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 667-673 |
title_sort |
bolboforma of eocene and lower oligocene sediments of maud rise, weddell sea, supplement to: kennett, diana m; kennett, james p (1990): bolboforma daniels and spiegler, from eocene and lower oligocene sediments, maud rise, antarctica. in: barker, pf; kennett, jp; et al. (eds.), proceedings of the ocean drilling program, scientific results, college station, tx (ocean drilling program), 113, 667-673 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1990 |
url |
https://dx.doi.org/10.1594/pangaea.753324 https://doi.pangaea.de/10.1594/PANGAEA.753324 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(-65.167,-65.167,-67.117,-67.117) |
geographic |
Antarctic The Antarctic Weddell Sea Weddell Maud Rise Kennett |
geographic_facet |
Antarctic The Antarctic Weddell Sea Weddell Maud Rise Kennett |
genre |
Antarc* Antarctic Antarctica Weddel Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Weddel Sea Weddell Sea |
op_relation |
https://dx.doi.org/10.2973/odp.proc.sr.113.208.1990 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.753324 https://doi.org/10.2973/odp.proc.sr.113.208.1990 |
_version_ |
1766241030781272064 |