Cenozoic Radiolaria (Exclusive of Theoperids, Artostrobiids, and Amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling ProjectLeg 10

Sanfilippo, Annika; Riedel, W. R.

doi:10.2973/dsdp.proc.10.119.1973

Cited by 50 publications

(84 citation statements)

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“…Eucyrtidium spinosum Zone and Campbell) group, described by Sanfilippo and Riedel (1973). Therefore, this species has been assigned to the genus Axoprunum here.…”

Section: A-xoprunumo Irregularis Zonementioning

confidence: 99%

“…This species is the same as some forms reported as Heliostylus spp. by Sanfilippo and Riedel (1973).…”

Section: Prunopyle Tetrapila Hays (Plate 2 Figs 1-2) Prunopyle Tetrmentioning

confidence: 99%

“…Lithatractus pierinae, described by Clark and Campbell (1942), has somewhat thin polar spines. Sanfilippo and Riedel (1973) mentioned that polar spines of Axoprunum pierinae group are variable in size and form. Here, I use this species name for forms usually having an ellipsoidal cortical shell and double medullary shells and thick polar spines.…”

Section: A-xoprunumo Irregularis Zonementioning

confidence: 99%

“…Sanfilippo and Riedel (1970) defined the Genus Cyrtocapsella as three-or four-segmented theoperids having a very constricted mouth. However, here, this genus name is also used for forms with an open mouth that have a shell structure similar to other Cyrtocapsella.…”

Section: Genus Clathrocyclas Haeckel 1882mentioning

confidence: 99%

“…Petrushevskaya and Kozlova (1972) described this genus minutely. Sanfilippo and Riedel (1973) adopted this genus name for describing the A. pierinae group. Here, I follow their taxonomy and use this name for all ellipsoidal forms having one cortical and two medullary shells and two polar spines, which usually are conical or rodlike.…”

Section: Systematic Descriptionmentioning

confidence: 99%

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Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

Takemura¹

1992

Proceedings of the Ocean Drilling Program

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During Ocean Drilling Program Leg 120, an almost complete Paleogene sediment section on the Kerguelen Plateau in the southern Indian Ocean was recovered. The biostratigraphy of radiolarians from these sediments at Sites 748 and 749 is studied. A biostratigraphic framework established in low and middle latitudes is not applicable because of the absence of most zonal marker species. Biogenic opal is present only in middle Eocene to Oligocene sediments, and three new zoncs-Lychnocanoma conica, Axoprunum{l) irregularis, and Eucyrtidium spinosum zones-are proposed. The Paleogene antarctic radiolarian fauna is different from that in low and middle latitudes. Three new species, Axoprunum{l) irregularis, Eucyrtidium cheni, and Eucyrtidium spinosum, are described. INTRODUCTIONDuring Ocean Drilling Program (ODP) Leg 120, scientists drilled five sites in the Central and Southern Kerguelen plateaus of the southern Indian Ocean. Although Paleogene radiolarians were obtained from four sites (Sites 747-750), two sites have either poorly preserved shells (Site 747) or insufficient recovery (Site 750). For this study, I performed Paleogene radiolarian biostratigraphic work for Sites 748 and 749.Paleogene radiolarians from Leg 120 range in age from the middle Eocene to the late Oligocene. Although the radiolarian zonation of this interval has already been established for lowlatitude areas (Sanfilippo et al., 1985), this scheme cannot be applied to Leg 120 samples because of the absence of almost all zonal markers recognized in tropical or subtropical areas. For instance, genera Podocyrtis and Thyrsocyrtis, both of which are the most important groups for defining the middle to late Eocene zones, were not observed in Leg 120 samples at all.Few previous studies of Paleogene radiolarians in the Antarctic Sea area exist. Petrushevskaya (1975) described many Paleogene forms from Deep Sea Drilling Project (DSDP) Leg 29. Chen (1975) treated Paleogene samples from Sites 264 and 274 of DSDP Leg 28, which have ages of Eocene and early Oligocene, respectively. He described radiolarians in these two assemblages, but no one has yet tried to zone a Paleogene interval in the Antarctic Sea. Weaver (1983) also reported on Paleogene radiolarians from the Falkland Plateau region in the southwest Atlantic. Although he studied middle Eocene to early Oligocene radiolarians and interpreted them from a paleoenvironmental perspective, he did not zone them, and no plates of Paleogene radiolarians appear in his study.ODP has conducted several cruises in the Antarctic Sea area (Legs 113, 114, 119, and 120). During Leg 113, scientists recovered radiolarian-bearing Paleogene cores at several sites in the Weddell Sea (Barker, Kennett, et al., 1988). Abelmann (1990) tic, and many Paleogene cores (Paleocene to Oligocene) that included radiolarians were obtained (Ciesielski, Kristoffersen, et al., 1988). During Leg 119, northernmost and southernmost Kerguelen Plateau and Prydz Bay sites were drilled (Barron, Larsen, et al., 1989). Eocene and Oligocene ra...

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“…Eucyrtidium spinosum Zone and Campbell) group, described by Sanfilippo and Riedel (1973). Therefore, this species has been assigned to the genus Axoprunum here.…”

Section: A-xoprunumo Irregularis Zonementioning

confidence: 99%

“…This species is the same as some forms reported as Heliostylus spp. by Sanfilippo and Riedel (1973).…”

Section: Prunopyle Tetrapila Hays (Plate 2 Figs 1-2) Prunopyle Tetrmentioning

confidence: 99%

Section: A-xoprunumo Irregularis Zonementioning

confidence: 99%

Section: Genus Clathrocyclas Haeckel 1882mentioning

confidence: 99%

Section: Systematic Descriptionmentioning

confidence: 99%

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Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

Takemura¹

1992

Proceedings of the Ocean Drilling Program

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The Paleogene Period

Speijer¹,

Pälike²,

Hollis³

et al. 2020

Geologic Time Scale 2020

107

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Upper Paleocene radiolarians from DSDP Sites 549 and 550, Goban Spur, NE Atlantic

2011

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Upper Paleocene-lower Eocene sequences of mainly pelagic sediments in DSDP Sites 549 11 and 550 of Goban Spur, NE Atlantic, representing time periods of 10 and 6 m.y. respectively, 12 were examined to investigate the biotic response of radiolarians to the PETM. The 13 preservation of radiolarians in the lower Eocene sequences for both sites is poor. Upper 14 Paleocene radiolarian assemblages, representing a time interval of ~ 59-56 Ma at Site 549 15 and a much shorter period at Site 550, are generally moderately well-preserved. Fifty four 16 species were identified. Four species occur significantly earlier in the middle high latitude NE 17 Atlantic than in New Zealand, where the sudden appearance during the PETM has been 18 taken as evidence of global pole-ward migration of warm-water radiolarians. Available 19 model shows that the Goban Spur area should belong to the subpolar surface ocean gyre in 20 the early Paleogene. Thus, our investigation questions the validity of the previously used 21 index species of subtropical warm water masses. High-latitude offshore sections across the 22 P/E boundary with well preserved radiolarians are needed to test the hypothesis of 23 pole-ward migration of warm-water radiolarians during this geologically transient global 24 warming period.

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Cenozoic Radiolaria (Exclusive of Theoperids, Artostrobiids, and Amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling ProjectLeg 10

Cited by 50 publications

References 4 publications

Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

The Paleogene Period

Upper Paleocene radiolarians from DSDP Sites 549 and 550, Goban Spur, NE Atlantic

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Cenozoic Radiolaria (Exclusive of Theoperids, Artostrobiids, and Amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling ProjectLeg 10

Cited by 50 publications

References 4 publications

Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

Radiolarian Paleogene Biostratigraphy in the Southern Indian Ocean, Leg 120

The Paleogene Period

Upper Paleocene radiolarians from DSDP Sites 549 and 550, Goban Spur, NE Atlantic

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Cenozoic Radiolaria (Exclusive of Theoperids, Artostrobiids, and Amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling ProjectLeg 10