Olafsson, Gunnar (1989): Calcareous nannofossil biostratigraphy of ODP Hole 108-667A and DSDP Site 85-574 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.746185, Supplement to: Olafsson, G (1989): Quantitative calcareous nannofossil biostratigraphy of upper Oligocene to middle Miocene sediment from ODP Hole 667A and middle Miocene sediment from DSDP Site 574. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 9-22, https://doi.org/10.2973/odp.proc.sr.108.121.1989
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Abstract:
Detailed quantitative analyses of selected calcareous nannofossil species were used to determine the placement of zonal boundaries. In Hole 667A in the equatorial Atlantic Ocean, Zones CP19 through CN5 were recognized, whereas at Site 574 in the equatorial Pacific Ocean, only the CN4/CN5 boundary could be determined. Boundaries were identified by sharp rises and declines in abundance at the beginnings and ends, respectively, of index fossil ranges. The sharp rise in abundance at the beginning of the range of Triquetrorhabdulus rugosus provided a good datum level in both regions; the same is true for the sharp decline in abundance at the end of the range of Cyclicargolithus floridanus. The last occurrence of Helicosphaera ampliaperta was used to mark the CN3/CN4 boundary in Hole 667A, while at Site 574, H. ampliaperta was absent. The abundance pattern of Triquetrorhabdulus carinatus obtained from Hole 667A makes it impossible to observe a distinct disappearance level. Age/depth plots reveal uniform sedimentation rates at both sites during early Miocene times. At Site 667 in the Atlantic the mean sedimentation rate was 14.90 m/m.y., and at Site 574 in the Pacific it was 16.17 m/m.y. during this same period. One new nannofossil species, Triquetrorhabdulus rioensis, is described; and one species, Triquetrorhabdulus serratus, is recombined.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 4.388950 * Median Longitude: -77.620750 * South-bound Latitude: 4.208700 * West-bound Longitude: -133.330200 * North-bound Latitude: 4.569200 * East-bound Longitude: -21.911300
Date/Time Start: 1982-04-11T00:00:00 * Date/Time End: 1986-04-12T10:00:00
Event(s):
85-574_Site * Latitude: 4.208700 * Longitude: -133.330200 * Date/Time: 1982-04-11T00:00:00 * Elevation: -4561.0 m * Penetration: 11.197 m * Recovery: 5.949 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 92 cores; 734.2 m cored; 0 m drilled; 81% recovery
108-667A * Latitude: 4.569200 * Longitude: -21.911300 * Date/Time Start: 1986-04-08T13:45:00 * Date/Time End: 1986-04-12T10:00:00 * Elevation: -3529.3 m * Penetration: 381.3 m * Recovery: 309.16 m * Location: South Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 41 core; 381.3 m cored; 0 m drilled; 81.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Olafsson, G (1989): (Table 2) Summary of middle Miocene datums of DSDP Site 85-574. https://doi.org/10.1594/PANGAEA.746184
- Olafsson, G (1989): (Table 1) Summary of lower and middle Miocene datums of ODP Hole 108-667A. https://doi.org/10.1594/PANGAEA.746183