Code numbers for Cenozoic low latitude radiolarian biostratigraphic zones and GPTS conversion tables

Sanfilippo, Annika; Nigrini, Catherine A

doi:10.1016/s0377-8398(97)00030-3

Cited by 136 publications

(97 citation statements)

References 35 publications

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“…Detailed biostratigraphic zonations could not be assigned to this assemblage because of the lack of biostratigraphically important species. However, the presence of Amphirhopalum ypsilon in Samples 344-U1381C-1H-CC through 4H-CC suggests a depositional age <1 Ma (Zone RN14; Sanfilippo and Nigrini, 1998).…”

Section: Radiolariansmentioning

confidence: 98%

“…The presence of D. antepenultima and D. laticonus in Samples 344-U1381C-7H-CC and 8H-CC is indicative of the early late Miocene (Zones RN6 and RN5). Samples 344-U1381C-9H-CC and 10H-CC are constrained to the late early Miocene (Zone RN5) because of the presence of Didymocyrtis violina (Sanfilippo and Nigrini, 1998). Radiolarian biostratigraphy suggests a hiatus of ~9 to 11 m.y.…”

Section: Radiolariansmentioning

confidence: 99%

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Input Site U1381

Harris¹,

Sakaguchi²,

Petronotis³

et al. 2013

Proceedings of the IODP

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Section: Radiolariansmentioning

confidence: 98%

Section: Radiolariansmentioning

confidence: 99%

Input Site U1381

Harris¹,

Sakaguchi²,

Petronotis³

et al. 2013

Proceedings of the IODP

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“…The zonal scheme of Sanfilippo and Nigrini (1998) was adopted for this study. The interval studied at Site U1331 was divided into nine radiolarian zones from Zone RP8 to RP16 (Sanfilippo and Nigrini, 1998).…”

Section: Resultsmentioning

confidence: 99%

“…The interval studied at Site U1331 was divided into nine radiolarian zones from Zone RP8 to RP16 (Sanfilippo and Nigrini, 1998). Terms used in this study to express events include evolutionary transition (ET), first occurrence (FO), and last occurrence (LO).…”

Section: Resultsmentioning

confidence: 99%

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Data report: early to middle Eocene radiolarian biostratigraphy, IODP Expedition 320 Site U1331, eastern equatorial Pacific

Kamikuri¹,

Moore²,

Ogane³

et al. 2012

Proceedings of the IODP

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Neogene paleoceanography of the eastern equatorial Pacific based on the radiolarian record of IODP drill sites off Costa Rica

Boltovskoy

Baxter

Baumgartner

2017

Geochem Geophys Geosyst

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The Integrated Ocean Drilling Program (IODP) Expedition 344 drilled cores following a transect across the convergent margin off Costa Rica. Two of the five sites (U1381 and U1414) are the subject of the present study. Major radiolarian faunal breaks and characteristic species groups were defined with the aid of cluster analysis, nodal analysis, and discriminant analysis of principal components. A middle‐late Miocene to Pleistocene age (radiolarian zones RN5 to RN16) was determined for the sites, which agrees with the nannofossil zonations and 40Ar/39Ar and tephra layers. Considering the northward movement of the Cocos plate (∼7.3 cm/yr), and a paleolatitude calculator, it is assumed that during the Miocene the two sites were located ∼1000 km to the southwest of their current position, slightly south of the equator. The radiolarian faunas retrieved were thus seemingly formed under the influence of different oceanic currents and sources of nutrients. Changes in the radiolarian assemblages at Site U1414 point at dissimilar environmental settings associated with the colder South Equatorial Current and the warmer Equatorial Countercurrent, as well as to coastal upwelling. These differences are best reflected by changes in the abundance of the morphotype Spongurus spp., with noticeably higher values during the Miocene, than in the Pliocene and the Pleistocene. Because Spongurus spp. is generally associated with cooler waters, these abundance variations (as well as those of several other species) suggest that during the Miocene the area had a stronger influence of colder waters than during younger periods. During the Pliocene and the lowermost Pleistocene, biogenic remains are scarce, presumably due to the terrigenous input, which could have diluted and affected the preservation of pelagic fossils, as well as to the displacement of the site to warmer waters. A typically tropical fauna characterized the Pleistocene, yet with widespread presence of colder water species, most probably indicative of the influence of coastal upwelling processes.

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Code numbers for Cenozoic low latitude radiolarian biostratigraphic zones and GPTS conversion tables

Cited by 136 publications

References 35 publications

Input Site U1381

Input Site U1381

Data report: early to middle Eocene radiolarian biostratigraphy, IODP Expedition 320 Site U1331, eastern equatorial Pacific

Neogene paleoceanography of the eastern equatorial Pacific based on the radiolarian record of IODP drill sites off Costa Rica

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