Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Gaer, Bradi T; Watkins, David K (2020): Morphometrics of the calcareous nannofossil genus Eiffellithus during the Turonian [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.913333

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
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.
Keyword(s):
Biometry; biostratigraphy; Calcareous nannofossils; Eiffellithus eximius; Taxonomy
Supplement to:
Gaer, Bradi T; Watkins, David K (2020): A biometric analysis of the Eiffellithus eximius species complex and its biostratigraphic implications. Marine Micropaleontology, 157, https://doi.org/10.1016/j.marmicro.2020.101876
Related to:
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
Coverage:
Median Latitude: -0.382795 * Median Longitude: -7.448607 * South-bound Latitude: -10.031389 * West-bound Longitude: -54.543880 * North-bound Latitude: 9.265800 * East-bound Longitude: 39.646667
Date/Time Start: 2003-02-07T04:30:00 * Date/Time End: 2003-02-09T07:35:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
8 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Gaer, BT; Watkins, DK (2020): Bar length analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A. https://doi.org/10.1594/PANGAEA.911272
  2. Gaer, BT; Watkins, DK (2020): Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A. https://doi.org/10.1594/PANGAEA.911275
  3. Gaer, BT; Watkins, DK (2020): Length analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A. https://doi.org/10.1594/PANGAEA.911276
  4. Gaer, BT; Watkins, DK (2020): Width analysis of 50 specimen from Eiffellithus coccolith from ODP Core 207-1260A. https://doi.org/10.1594/PANGAEA.911278
  5. Gaer, BT; Watkins, DK (2020): Bar length analysis of 50 specimen from Eiffellithus coccolith from sediment core TDP-31. https://doi.org/10.1594/PANGAEA.911279
  6. Gaer, BT; Watkins, DK (2020): Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from sedeiment core TDP-31. https://doi.org/10.1594/PANGAEA.911282
  7. Gaer, BT; Watkins, DK (2020): Length analysis of 50 specimen from Eiffellithus coccolith from sediment core TDP-31. https://doi.org/10.1594/PANGAEA.911283
  8. Gaer, BT; Watkins, DK (2020): Width analysis of 50 specimen from Eiffellithus coccolith from sediment core TDP-31. https://doi.org/10.1594/PANGAEA.911284