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Firth, John V (1989): Eocene-Oligocene nannofossils from the Labrador Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745228, Supplement to: Firth, JV (1989): Eocene and Oligocene calcareous nannofossils from the Labrador Sea, ODP Leg 105. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 263-286, https://doi.org/10.2973/odp.proc.sr.105.131.1989

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Abstract:
During Ocean Drilling Program (ODP) Leg 105, a thick sequence of lower Eocene to lower Oligocene sediments was recovered from Hole 647A in the southern Labrador Sea. These sediments contain diverse, well-preserved, high-latitude calcareous nannofossil flora. The nannofossil biostratigraphy of the hole indicates the presence of a minor hiatus between Zones NP 16 and NP 17 in the upper middle Eocene and a barren interval separating Zones NP 13 and NP 15. Species abundance is highest within the lower to middle Eocene and starts to decline near the base of the upper Eocene. No major change in the nannoflora was observed across the Eocene/Oligocene boundary, although a slight decrease in species abundance was recorded. The Paleogene calcareous nannofossils of nearby DSDP Site 112 were reexamined and compared with those of Site 647. Several cores were reassigned to different nannofossil zones. The calcareous nannoflora are dominated by high-latitude indicative species and also exhibit a high diversity, which suggests the influence of more temperate water masses in this region during Eocene and Oligocene time. One new subspecies from the middle Eocene, Sphenolithus furcatolithoides labradorensis, is described.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 53.468380 * Median Longitude: -45.530400 * South-bound Latitude: 53.331300 * West-bound Longitude: -46.604000 * North-bound Latitude: 54.016700 * East-bound Longitude: -45.262000
Date/Time Start: 1970-06-29T00:00:00 * Date/Time End: 1985-10-23T18:15:00
Event(s):
12-112 * Latitude: 54.016700 * Longitude: -46.604000 * Date/Time: 1970-06-29T00:00:00 * Elevation: -3657.0 m * Penetration: 664 m * Recovery: 75.1 m * Location: North Atlantic * Campaign: Leg12 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 201 m cored; 0 m drilled; 37.4 % recovery
105-647A * Latitude: 53.331300 * Longitude: -45.262000 * Date/Time Start: 1985-10-15T04:10:00 * Date/Time End: 1985-10-23T18:15:00 * Elevation: -3869.0 m * Penetration: 736 m * Recovery: 444.6 m * Location: South Atlantic Ocean * Campaign: Leg105 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 75 cores; 716.6 m cored; 0 m drilled; 62 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Firth, JV (1989): (Table 5) Eocene-Oligocene calcareous nannofossils from DSDP Hole 12-112. https://doi.org/10.1594/PANGAEA.745227
  2. Firth, JV (1989): (Table 4) Lower Eocene calcareous nannofossils from ODP Hole 105-647A. https://doi.org/10.1594/PANGAEA.745226
  3. Firth, JV (1989): (Table 3) Middle Eocene calcareous nannofossils from ODP Hole 105-647A. https://doi.org/10.1594/PANGAEA.745225
  4. Firth, JV (1989): (Table 1) Oligocene calcareous nannofossils from ODP Hole 105-647A. https://doi.org/10.1594/PANGAEA.745223
  5. Firth, JV (1989): (Table 2) Upper Eocene calcareous nannofossils from ODP Hole 105-647A. https://doi.org/10.1594/PANGAEA.745224