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McGonigal, Kristeen L; Di Stefano, Agata (2002): Calcareous nannofossil abundance and datum events of ODP Holes 181-1123C and 181-1124C, southwest Pacific [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786263, Supplement to: McGonigal, KL; Di Stefano, A (2002): Calcareous nannofossil biostratigraphy of the Eocene-Oligocene transition, ODP Sites 1123 and 1124. In: Richter, C (ed.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 181, 1-22, https://doi.org/10.2973/odp.proc.sr.181.207.2002

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Published: 2002 (exact date unknown) • DOI registered: 2012-08-15

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Abstract:
Seven sites were drilled off the eastern shore of New Zealand during Ocean Drilling Program Leg 181 to gain knowledge of southwest Pacific ocean history, in particular, the evolution of the Pacific Deep Western Boundary Current (DWBC). Holes 1123C and 1124C penetrated lower Oligocene to middle Eocene sediments containing moderately to poorly preserved calcareous nannofossils. Nannofossil assemblages show signs of dissolution and overgrowth, but key marker species can be identified. Nannofossil abundance ranges from abundant to barren. The lower Oligocene sediments are distinctly separated from the overlying Neogene sequences by the Marshall Paraconformity, a regional marker of environmental and sea level change. An age-depth model for Hole 1123C through this sequence was constructed using nine nannofossil age datums and three magnetostratigraphic datums. There is good agreement between the biostratigraphy and magnetostratigraphy, which indicates that the Marshall Paraconformity spans ~12 m.y. in Hole 1123C. The same sequence in Hole 1124C is disrupted by at least three hiatuses, complicating interpretation of the sedimentation history. The Marshall Paraconformity spans at least 3 m.y. in Hole 1124C. A 4- m.y. gap separates lower Oligocene and middle Eocene sediments, and a ~15 m.y. hiatus separates middle Eocene mudstones from middle Paleocene nannofossil-bearing mudstones. Nannofossil biostratigraphy from Holes 1123C and 1124C indicates that the Eocene-Oligocene transition was a time of fluctuating biota and intensification of the DWBC along the New Zealand margin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -40.642065 * Median Longitude: -174.015280 * South-bound Latitude: -41.785780 * West-bound Longitude: -176.531560 * North-bound Latitude: -39.498350 * East-bound Longitude: -171.499000
Date/Time Start: 1998-09-19T09:55:00 * Date/Time End: 1998-09-30T16:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
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Datasets listed in this publication series

  1. McGonigal, KL; Di Stefano, A (2002): (Table T3) Calcareous nannofossil and magnetostratigraphic datums and ages of ODP Hole 181-1123C sediments. https://doi.org/10.1594/PANGAEA.786261
  2. McGonigal, KL; Di Stefano, A (2002): (Table T1) Calcareous nannofossil abundance in ODP Hole 181-1123C sediments. https://doi.org/10.1594/PANGAEA.786259
  3. McGonigal, KL; Di Stefano, A (2002): (Table T4) Calcareous nannofossil and magnetostratigraphic datums and ages of ODP Hole 181-1124C sediments. https://doi.org/10.1594/PANGAEA.786262
  4. McGonigal, KL; Di Stefano, A (2002): (Table T2) Calcareous nannofossil abundance in ODP Hole 181-1124C sediments. https://doi.org/10.1594/PANGAEA.786260