Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A
The evolution of the calcareous nannofossil E. turriseiffelii - E. eximius lineage in the Turonian from the western tropical Atlantic and Indian Ocean indicates identical eiffellithid forms with morphological change in the rotation of the crossbar, relative to the longitudinal axis, from an "x&...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.911275 2023-05-15T17:35:42+02:00 Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A Gaer, Bradi T Watkins, David K LATITUDE: 9.265800 * LONGITUDE: -54.543880 * DATE/TIME START: 2003-02-07T04:30:00 * DATE/TIME END: 2003-02-09T07:35:00 * MINIMUM ELEVATION: -2548.8 m * MAXIMUM ELEVATION: -2548.8 m 2020-01-24 text/tab-separated-values, 2756 data points https://doi.pangaea.de/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.911275 en eng PANGAEA https://doi.org/10.1594/PANGAEA.913333 Huber, Brian T; Petrizzo, Maria Rose; Watkins, David K; Haynes, Shannon J; MacLeod, Kenneth G (2017): Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy. Newsletters on Stratigraphy, 50(2), 141-185, https://doi.org/10.1127/nos/2017/0373 ODP Leg 207 Shipboard Scientific Party (2004): Site 1260. In: Erbacher, J.; Mosher, D.C.; Malone, M.J.; et al. (eds.), Proceedings of the Ocean Drilling Program, 207 Initial Reports, Proceedings of the Ocean Drilling Program, 207, Ocean Drilling Program, https://doi.org/10.2973/odp.proc.ir.207.107.2004 https://doi.pangaea.de/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.911275 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 207-1260A Biometry biostratigraphy Calcareous nannofossils Depth composite DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Eiffellithus eximius Eiffellithus sp. cross bar angle Joides Resolution Leg207 North Atlantic Ocean Sample code/label Sample ID Taxonomy Dataset 2020 ftpangaea https://doi.org/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.913333 https://doi.org/10.1127/nos/2017/0373 https://doi.org/10.2973/odp.proc.ir.207.107.2004 2023-01-20T10:02:05Z The evolution of the calcareous nannofossil E. turriseiffelii - E. eximius lineage in the Turonian from the western tropical Atlantic and Indian Ocean indicates identical eiffellithid forms with morphological change in the rotation of the crossbar, relative to the longitudinal axis, from an "x" (E. turriseiffelii) to a "+" (E. eximius). Within these indistinguishable eiffellithid assemblages, neither the size nor shape show significant change during the morphological transition of the crossbar orientation. The rotation of the crossbar toward an axial alignment results in two shifts in the mean angle values. Prior to the first shift, the mean angles of the eiffellithid assemblage have values between 35o and 45o with no forms with crossbar angles of <20o. The first step occurs at the appearance of specimens with crossbar angles between 20o and 10o marking the first appearance datum (FAD) of E. eximius s. Ver. The second shift is a significant change in the mean angle values from 35-45o to 15-22o among the Eiffellithus assemblage and the appearance of morphotypes with crossbar angles of <10o recognized as E. eximius s.s. The results of this biometric study indicate that two forms can be reliably recognized and used to increase the biostratigraphic resolution, with the FAD of E. eximius s. Verbeek near the middle to upper Turonian boundary and E. eximius s.s. near the lower to middle Turonian boundary. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(-54.543880,-54.543880,9.265800,9.265800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
207-1260A Biometry biostratigraphy Calcareous nannofossils Depth composite DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Eiffellithus eximius Eiffellithus sp. cross bar angle Joides Resolution Leg207 North Atlantic Ocean Sample code/label Sample ID Taxonomy |
spellingShingle |
207-1260A Biometry biostratigraphy Calcareous nannofossils Depth composite DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Eiffellithus eximius Eiffellithus sp. cross bar angle Joides Resolution Leg207 North Atlantic Ocean Sample code/label Sample ID Taxonomy Gaer, Bradi T Watkins, David K Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
topic_facet |
207-1260A Biometry biostratigraphy Calcareous nannofossils Depth composite DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Eiffellithus eximius Eiffellithus sp. cross bar angle Joides Resolution Leg207 North Atlantic Ocean Sample code/label Sample ID Taxonomy |
description |
The evolution of the calcareous nannofossil E. turriseiffelii - E. eximius lineage in the Turonian from the western tropical Atlantic and Indian Ocean indicates identical eiffellithid forms with morphological change in the rotation of the crossbar, relative to the longitudinal axis, from an "x" (E. turriseiffelii) to a "+" (E. eximius). Within these indistinguishable eiffellithid assemblages, neither the size nor shape show significant change during the morphological transition of the crossbar orientation. The rotation of the crossbar toward an axial alignment results in two shifts in the mean angle values. Prior to the first shift, the mean angles of the eiffellithid assemblage have values between 35o and 45o with no forms with crossbar angles of <20o. The first step occurs at the appearance of specimens with crossbar angles between 20o and 10o marking the first appearance datum (FAD) of E. eximius s. Ver. The second shift is a significant change in the mean angle values from 35-45o to 15-22o among the Eiffellithus assemblage and the appearance of morphotypes with crossbar angles of <10o recognized as E. eximius s.s. The results of this biometric study indicate that two forms can be reliably recognized and used to increase the biostratigraphic resolution, with the FAD of E. eximius s. Verbeek near the middle to upper Turonian boundary and E. eximius s.s. near the lower to middle Turonian boundary. |
format |
Dataset |
author |
Gaer, Bradi T Watkins, David K |
author_facet |
Gaer, Bradi T Watkins, David K |
author_sort |
Gaer, Bradi T |
title |
Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
title_short |
Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
title_full |
Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
title_fullStr |
Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
title_full_unstemmed |
Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A |
title_sort |
cross bar angle analysis of 50 specimen from eiffellithus coccolith from odp core 207-1260a |
publisher |
PANGAEA |
publishDate |
2020 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.911275 |
op_coverage |
LATITUDE: 9.265800 * LONGITUDE: -54.543880 * DATE/TIME START: 2003-02-07T04:30:00 * DATE/TIME END: 2003-02-09T07:35:00 * MINIMUM ELEVATION: -2548.8 m * MAXIMUM ELEVATION: -2548.8 m |
long_lat |
ENVELOPE(-54.543880,-54.543880,9.265800,9.265800) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://doi.org/10.1594/PANGAEA.913333 Huber, Brian T; Petrizzo, Maria Rose; Watkins, David K; Haynes, Shannon J; MacLeod, Kenneth G (2017): Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy. Newsletters on Stratigraphy, 50(2), 141-185, https://doi.org/10.1127/nos/2017/0373 ODP Leg 207 Shipboard Scientific Party (2004): Site 1260. In: Erbacher, J.; Mosher, D.C.; Malone, M.J.; et al. (eds.), Proceedings of the Ocean Drilling Program, 207 Initial Reports, Proceedings of the Ocean Drilling Program, 207, Ocean Drilling Program, https://doi.org/10.2973/odp.proc.ir.207.107.2004 https://doi.pangaea.de/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.911275 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.911275 https://doi.org/10.1594/PANGAEA.913333 https://doi.org/10.1127/nos/2017/0373 https://doi.org/10.2973/odp.proc.ir.207.107.2004 |
_version_ |
1766134958594719744 |