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Backman, Jan (1986): Paleocene and Eocene nannofossil datums from Shatsky Rise and Walvis Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.705310, Supplement to: Backman, J (1986): Late Paleocene to middle Eocene calcareous nannofossil biochronology from the Shatsky Rise, Walvis Ridge and Italy. Palaeogeography, Palaeoclimatology, Palaeoecology, 57(1), 43-59, https://doi.org/10.1016/0031-0182(86)90005-2

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Abstract:
The precision of late Paleocene to middle Eocene nannofossil datums is investigated by means of quantitative methods and correlated to the magnetic polarity stratigraphy, using sequences from the Northwest Pacific, Southeast Atlantic and Italy. It is the rule rather than the exception to find tails of very reduced abundances prior to, or after, a range of consistent and higher abundances. The absolutely first or final occurrence of a species, therefore, seldom provides a synchronous datum when material from different geographic areas are compared. On the other band, synchroneity is often confirmed when the initial sharp rise or the final sharp decline in abundance is used as datum level. The use of datums not employed in the two principal existing nannofossil zonal schemes can substantially improve the biostratigraphic resolution. Two established zonal markers show abundance patterns making them unsuitable as datums: the first occurrences of Ellipsolithus macellus (base NP4, diachronous) and Tribrachiatus nunnii (base NP10 and Paleocene/Eocene boundary, too rare and too short range in open ocean sections). The first occurrence of either Fasciculithus spp. or Sphenolithus spp. is a better marker near the base of NP4. The first occurrence of Discoaster diastypus at 56.6 Ma represents a suitable replacement for recognition of the Paleocene/Eocene boundary.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -8.041433 * Median Longitude: 53.936850 * South-bound Latitude: -28.524800 * West-bound Longitude: 1.763300 * North-bound Latitude: 32.442200 * East-bound Longitude: 157.723300
Date/Time Start: 1980-06-28T00:00:00 * Date/Time End: 1982-05-23T00:00:00
Event(s):
74-527 * Latitude: -28.041500 * Longitude: 1.763300 * Date/Time: 1980-06-28T00:00:00 * Elevation: -4428.0 m * Penetration: 384.5 m * Recovery: 243.4 m * Location: South Atlantic * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 380 m cored; 4.5 m drilled; 64.1 % recovery
74-528 * Latitude: -28.524800 * Longitude: 2.324000 * Date/Time: 1980-07-04T00:00:00 * Elevation: -3800.0 m * Penetration: 555 m * Recovery: 271.9 m * Location: South Atlantic/RIDGE * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 47 cores; 441 m cored; 0 m drilled; 61.7 % recovery
86-577 * Latitude: 32.441800 * Longitude: 157.723300 * Date/Time: 1982-05-23T00:00:00 * Elevation: -2675.0 m * Penetration: 118.8 m * Recovery: 111.1 m * Location: North Pacific * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 118.8 m cored; 0 m drilled; 93.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Backman, J (1986): (Table 1) Eocene nannofossil datums of DSDP Hole 74-527. https://doi.org/10.1594/PANGAEA.705304
  2. Backman, J (1986): (Table 2) Paleocene nannofossil datums of DSDP Hole 74-527. https://doi.org/10.1594/PANGAEA.705307
  3. Backman, J (1986): (Table 1) Eocene nannofossil datums of DSDP Hole 74-528. https://doi.org/10.1594/PANGAEA.705305
  4. Backman, J (1986): (Table 2) Paleocene nannofossil datums of DSDP Hole 74-528. https://doi.org/10.1594/PANGAEA.705308
  5. Backman, J (1986): (Table 1) Eocene nannofossil datums of DSDP Site 86-577. https://doi.org/10.1594/PANGAEA.705306
  6. Backman, J (1986): (Table 2) Paleocene nannofossil datums of DSDP Site 86-577. https://doi.org/10.1594/PANGAEA.705309