Cenozoic Nannofossils, Central Equatorial Pacific, Deep Sea Drilling Project Leg 85

Pujos, A.

doi:10.2973/dsdp.proc.85.114.1985

Cited by 23 publications

(27 citation statements)

References 12 publications

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“…We propose a slightly older age (19.5 Ma) for this event, because it appears to fall approximately midway between the FO of S. heteromorphus and S. belemnos. This age estimate is supported by results from DSDP Site 574 (19.3 Ma;Pujos, 1985;Olafsson, 1989).…”

Section: Early Miocenesupporting

confidence: 77%

Neogene Low-Latitude Magnetostratigraphy from Site 710 and Revised Age Estimates of Miocene Nannofossil Datum Events

Backman¹,

Schneider²,

Rio³

et al. 1990

Proceedings of the Ocean Drilling Program

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Ocean Drilling Program Leg 115 recovered, for the first time, a largely continuous Neogene magnetostratigraphic sequence from an equatorial environment. This sequence (Site 710) has been correlated to the geomagnetic polarity time scale by means of nannofossil biostratigraphy. When the Miocene nannofossil magnetobiochronology from Site 710 is compared with other predominantly mid-latitude magnetobiochronologies, an evaluation of consistency can be made. The results require substantial revision of the age estimates of Miocene nannofossil zonal markers, relative to the values presented in the currently accepted Neogene nannofossil chronology.

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Section: Early Miocenesupporting

confidence: 77%

Neogene Low-Latitude Magnetostratigraphy from Site 710 and Revised Age Estimates of Miocene Nannofossil Datum Events

Backman¹,

Schneider²,

Rio³

et al. 1990

Proceedings of the Ocean Drilling Program

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“…The results are compared with data from Deep Sea Drilling Project (DSDP) Site 574, partly gathered in this study and partly from Pujos (1985). Site 574 was chosen mainly because it is an equatorial site from a different ocean basin.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Calcareous Nannofossil Biostratigraphy of Upper Oligocene to Middle Miocene Sediment from ODP Hole 667A and Middle Miocene Sediment from DSDP Site 574

Olafsson¹

1989

Proceedings of the Ocean Drilling Program

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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.

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“…As a matter of fact, Gartner (1977) divided the Pleistocene into seven zones, and further refinements have been suggested by several authors (e.g., Pujos, 1985aTakayama and Sato, 1987;Rio et al, 1988;Matsuoka and Okada, in press). One of the aims for Leg 115 is to examine the possibility of establishing a high-resolution biostratigraphy for the Pleistocene in the Indian Ocean.…”

Section: Biostratigraphy Calcareous Nannofossilsmentioning

confidence: 82%

Explanatory Notes

1988

Proceedings of the Ocean Drilling Program

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Cenozoic Nannofossils, Central Equatorial Pacific, Deep Sea Drilling Project Leg 85

Cited by 23 publications

References 12 publications

Neogene Low-Latitude Magnetostratigraphy from Site 710 and Revised Age Estimates of Miocene Nannofossil Datum Events

Neogene Low-Latitude Magnetostratigraphy from Site 710 and Revised Age Estimates of Miocene Nannofossil Datum Events

Quantitative Calcareous Nannofossil Biostratigraphy of Upper Oligocene to Middle Miocene Sediment from ODP Hole 667A and Middle Miocene Sediment from DSDP Site 574

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