The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410
Sphenoliths are a diverse and evolutionarily dynamic group of Cenozoic nannofossils which are widely used in biostratigraphic and paleoecological studies. We document the early-middle Eocene evolutionary succession of sphenoliths from IODP Site U1410 in the NW Atlantic Ocean (Southeast Newfoundland...
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Schweizerbart und Borntraeger
2021
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10109241 2023-12-24T10:22:29+01:00 The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 Cappelli, C Bown, PR De Riu, M Agnini, C 2021 https://discovery.ucl.ac.uk/id/eprint/10109241/ eng eng Schweizerbart und Borntraeger https://discovery.ucl.ac.uk/id/eprint/10109241/ Newsletters on Stratigraphy , 54 (4) pp. 405-431. (2021) calcareous nannofossils early-middle Eocene Sphenolithus biostratigraphy evolution Article 2021 ftucl 2023-11-27T13:07:34Z Sphenoliths are a diverse and evolutionarily dynamic group of Cenozoic nannofossils which are widely used in biostratigraphic and paleoecological studies. We document the early-middle Eocene evolutionary succession of sphenoliths from IODP Site U1410 in the NW Atlantic Ocean (Southeast Newfoundland Ridge). The exquisite nannofossil preservation at this site allows us to better delineate the morphologic and optical features of these sphenoliths and to document new fragile morphotypes. These include forms bearing long and fragile lateral processes (the ‘spiny sphenoliths’ group) that are the possible ancestors of the Sphenolithus furcatolithoides group, which is characterized by well-developed apical cycles and typically bifurcating spines. New quantitative stratigraphic analyses highlight the biostratigraphic potential of the S. furcatolithoides group throughout Zones NP14-NP15 (Martini 1971) and six key intervals characterized by shifting sphenolith assemblage compositions are identified through the early-middle Eocene. These are: 1) the post-EECO S. moriformis decrease, 2) the S. radians-S. spiniger turnover across the Ypresian-Lutetian transition, 3) the appearance and diversification of the ‘spiny sphenoliths’ group during the early Lutetian, and 4–6) development of the S. furcatolithoides evolutionary lineage, including S. pseudofurcatolithoides (sp. nov., former S. furcatolithoides morphotype A), S. cuniculus, S. furcatolithoides (former S. furcatolithoides morphotype B) and S. strigosus. Assemblage compositions shifts and stable isotope records indicate possible environmental forcing on sphenolith evolution, suggesting the group is sensitive to changes in trophic and/or thermal conditions. Article in Journal/Newspaper Newfoundland North Atlantic University College London: UCL Discovery |
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Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
calcareous nannofossils early-middle Eocene Sphenolithus biostratigraphy evolution |
spellingShingle |
calcareous nannofossils early-middle Eocene Sphenolithus biostratigraphy evolution Cappelli, C Bown, PR De Riu, M Agnini, C The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
topic_facet |
calcareous nannofossils early-middle Eocene Sphenolithus biostratigraphy evolution |
description |
Sphenoliths are a diverse and evolutionarily dynamic group of Cenozoic nannofossils which are widely used in biostratigraphic and paleoecological studies. We document the early-middle Eocene evolutionary succession of sphenoliths from IODP Site U1410 in the NW Atlantic Ocean (Southeast Newfoundland Ridge). The exquisite nannofossil preservation at this site allows us to better delineate the morphologic and optical features of these sphenoliths and to document new fragile morphotypes. These include forms bearing long and fragile lateral processes (the ‘spiny sphenoliths’ group) that are the possible ancestors of the Sphenolithus furcatolithoides group, which is characterized by well-developed apical cycles and typically bifurcating spines. New quantitative stratigraphic analyses highlight the biostratigraphic potential of the S. furcatolithoides group throughout Zones NP14-NP15 (Martini 1971) and six key intervals characterized by shifting sphenolith assemblage compositions are identified through the early-middle Eocene. These are: 1) the post-EECO S. moriformis decrease, 2) the S. radians-S. spiniger turnover across the Ypresian-Lutetian transition, 3) the appearance and diversification of the ‘spiny sphenoliths’ group during the early Lutetian, and 4–6) development of the S. furcatolithoides evolutionary lineage, including S. pseudofurcatolithoides (sp. nov., former S. furcatolithoides morphotype A), S. cuniculus, S. furcatolithoides (former S. furcatolithoides morphotype B) and S. strigosus. Assemblage compositions shifts and stable isotope records indicate possible environmental forcing on sphenolith evolution, suggesting the group is sensitive to changes in trophic and/or thermal conditions. |
format |
Article in Journal/Newspaper |
author |
Cappelli, C Bown, PR De Riu, M Agnini, C |
author_facet |
Cappelli, C Bown, PR De Riu, M Agnini, C |
author_sort |
Cappelli, C |
title |
The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
title_short |
The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
title_full |
The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
title_fullStr |
The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
title_full_unstemmed |
The evolution of Eocene (Ypresian/Lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from North Atlantic Site IODP U1410 |
title_sort |
evolution of eocene (ypresian/lutetian) sphenoliths: biostratigraphic implications and paleoceanographic significance from north atlantic site iodp u1410 |
publisher |
Schweizerbart und Borntraeger |
publishDate |
2021 |
url |
https://discovery.ucl.ac.uk/id/eprint/10109241/ |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Newsletters on Stratigraphy , 54 (4) pp. 405-431. (2021) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10109241/ |
_version_ |
1786191819191615488 |