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Saito, Tsunemasa (1985): Occurrence and estimated abundance of planktonic foraminifers at DSDP Leg 85 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803244, Supplement to: Saito, T (1985): Planktonic foraminiferal biostratigraphy of eastern Equatorial Pacific sediments, Deep Sea Drilling Project Leg 85. In: Mayer, L; Theyer, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Print Office), 85, 621-653, https://doi.org/10.2973/dsdp.proc.85.116.1985

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Abstract:
Tropical planktonic foraminifers occur throughout the sequences at all sites of Leg 85, and the standard planktonic foraminiferal zonation of Blow (1969) is applicable to most of the recovered sequences. However, the abundance and state of preservation of foraminifers decline markedly in certain intervals because of the effects of dissolution. Although siliceous microfossils studied on this leg indicate recovery of nearly complete records for the Pleistocene to Oligocene interval, the planktonic foraminiferal biostratigraphy is interrupted by strongly dissolved sections at all sites. Particularly, faunas assignable to Zone N7 (early Miocene) and Zone N15-16 (early late Miocene) are almost totally unrecognizable throughout the eastern equatorial Pacific. Well-preserved and diverse planktonic foraminifers occur in the lower middle Miocene, where the evolutionary developments of Orbulina universa d'Orbigny and Globorotalia fohsi Cushman and Ellisor are well represented. The Orbulina first appearance datum is observed to be nearly coincident with the last occurrence level of the diatom Annellus californicus Tempère, thus .establishing an age of 15 Ma for this datum by using the paleomagnetic calibration of the diatom datum. Moderately well-preserved late Eocene planktonic foraminifers occur in the carbonate sediments immediately overlying the basalt basement at Sites 573 and 574. The Eocene-Oligocene faunal transition, however, is masked at both sites by an intercalation of metalliferous layers containing no planktonic foraminifers.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 2.904017 * Median Longitude: -123.916983 * South-bound Latitude: 0.498500 * West-bound Longitude: -135.036000 * North-bound Latitude: 5.850000 * East-bound Longitude: -113.842000
Date/Time Start: 1982-03-19T00:00:00 * Date/Time End: 1982-04-21T00:00:00
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. Saito, T (1985): (Table 2) Occurrence and estimated abundance of planktonic foraminifers at DSDP Hole 85-571. https://doi.org/10.1594/PANGAEA.803237
  2. Saito, T (2012): (Table 3A) Occurrence and estimated abundance of planktonic foraminifers at DSDP Holes 85-572 and 85-572A. https://doi.org/10.1594/PANGAEA.803238
  3. Saito, T (1985): (Table 3B) Occurrence and estimated abundance of planktonic foraminifers at DSDP Holes 85-572C and 85-572D. https://doi.org/10.1594/PANGAEA.803239
  4. Saito, T (1985): (Table 4) Occurrence and estimated abundance of planktonic foraminifers at DSDP Site 85-573. https://doi.org/10.1594/PANGAEA.803241
  5. Saito, T (1985): (Table 5) Occurrence and estimated abundance of planktonic foraminifers at DSDP Site 85-574. https://doi.org/10.1594/PANGAEA.803242
  6. Saito, T (1985): (Table 6) Occurrence and estimated abundance of planktonic foraminifers at DSDP Site 85-575. https://doi.org/10.1594/PANGAEA.803243