Calcareous Nannofossils across the K/T Boundary|ODP Hole 690C|Maud Rise|Weddell Sea

Pospichal, James J; Wise, Sherwood W.

doi:10.2973/odp.proc.sr.113.204.1990

Cited by 28 publications

(45 citation statements)

References 13 publications

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“…Although successive species dominance was observed at low-latitude sites (particularly well illustrated by Monechi [1979] (Pospichal and Wise 1990). As at Site 690, Prediscosphaera stoveri is very common in the Upper Cretaceous assemblages described in this study.…”

Section: Discussionmentioning

confidence: 80%

“…As at other high-latitude localities (e.g., Stevens Klint section, Denmark: Perch-Nielsen, 1979b; DSDP Site 524: Perch-Nielsen et al, 1982; ODP Sites 690 and 752: Pospichal, 1989) and in contrast with low-latitude sections, no Thoracosphaera occurs in the Maestrichtian assemblages from Hole 750A. As in other high-latitude sites (e.g., Denmark: Perch-Nielsen, 1979b; ODP Site 690: Pospichal and Wise, 1990), Placozygus sigmoides is common above the boundary. This species is rare in early Paleocene assemblages from low-latitude regions (e.g., Biarritz: Perch-Nielsen, 1979c; Gubbio: Monechi, 1979;Zumaya: Percival and Fischer, 1977).…”

Section: Discussionmentioning

confidence: 98%

“…There are only a few reports dealing with high-latitude sections (Perch-Nielsen, 1979b;Perch-Nielsen et al, 1982) and only one study of a southern high-latitude site (Pospichal and Wise, 1990). Perch-Nielsen et al (1982) pointed out some of the differences observed in the calcareous nannofossil assemblages between low and high latitudes.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, semiquantitative studies documenting the changes that the calcareous nannoplankton underwent across the Cretaceous/Paleocene boundary have become available (Percival and Fischer, 1977;Romein, 1977;Monechi, 1979;PerchNielsen, 1979aPerchNielsen, , 1979bHerm et al, 1981;Romein and Smit, 1981;Thierstein, 1981;Jiang and Gartner, 1986;Pospichal and Wise, 1990). Most of them, however, concern sections geo- Notes: Counts were performed on two samples taken at 112-113 cm in Section 120-750A-15R-3: one in the white chalk, one in the greenish chalk.…”

Section: Discussionmentioning

confidence: 99%

“…7; Tables 8-10). Jiang and Gartner (1986) and Pospichal and Wise (1990) reported on the occurrence of H. teuriensis from the Brazos River section (Texas) and of//, edwardsii from Site 690 (Maud Rise, Weddell Sea), respectively, in the lowermost Paleocene. These reports and ours indicate that the frequency of H. teuriensis in earliest Paleocene assemblages varies with latitude, from scarce at low latitudes to abundant at high latitudes.…”

Section: The Persistent Generamentioning

confidence: 99%

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Calcareous Nannoplankton Changes across the Cretaceous/Paleocene Boundary in the Southern Indian Ocean (Site 750)

Ehrendorfer¹,

Aubry²

1992

Proceedings of the Ocean Drilling Program

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Changes in the composition of calcareous nannoplankton across the Cretaceous/Paleocene boundary at southern high-latitude Ocean Drilling Program Hole 750A are documented in this semiquantitative study. These changes are compared with changes described from other localities at high-and low-latitudes. This study provides additional data toward a detailed documentation of the paleontologic changes that occurred in the late Maestrichtian and the early Paleocene, despite limitations to the interpretation caused by coring gaps, drilling disturbance, and the presence of an unconformity at the boundary at this site.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Persistent Generamentioning

confidence: 99%

See 3 more Smart Citations

Calcareous Nannoplankton Changes across the Cretaceous/Paleocene Boundary in the Southern Indian Ocean (Site 750)

Ehrendorfer¹,

Aubry²

1992

Proceedings of the Ocean Drilling Program

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The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

et al. 2016

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The latest Campanian-earliest Maastrichtian interval is well known as a period of intense climate cooling. This cooling caused a distinctive bipolar biogeographic distribution of calcareous nannofossil assemblages: High-latitude settings were dominated by newly evolving endemic taxa, former cosmopolitan species disappeared at the same time, and equatorial communities experienced an invasion of cool water taxa. The impact of this cooling on northern midlatitude assemblages is, however, less well known. In order to overcome this gap we studied the Kronsmoor section (northwest Germany). This section provides a continuous upper Campanian-lower Maastrichtian succession with moderately to well preserved nannofossils. Uppermost Campanian assemblages are dominated by Prediscosphaera cretacea; other common taxa include Prediscosphaera stoveri, Watznaueria barnesiae, and Micula staurophora. The lower Maastrichtian is characterized by lower numbers of P. cretacea and frequent Kamptnerius magnificus, Arkhangelskiella cymbiformis, and Cribrosphaerella ehrenbergii. These changes reflect, in part, the Campanian-Maastrichtian boundary cooling since some successful taxa (e.g., K. magnificus) are related to cool surface waters. Other shifts in the nannofossil communities were perhaps the result of a changing nutrient regime. Stronger latitudinal gradients may have increased wind velocities and thus the eolian input of ferruginous dust required by N-fixing bacteria. The enhanced high-latitude deep water formation probably changed the bottom water environment in disfavor of denitrificating organisms. A decline of chemical weathering and fluviatile transport may have reduced the amount of bioavailable phosphate. These processes led to an increased nitrate and a decreased phosphate content shifting the nutrient regime from nitrate toward phosphate limitation.

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Maastrichtian–Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework

et al. 2021

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Calcareous Nannofossils across the K/T Boundary|ODP Hole 690C|Maud Rise|Weddell Sea

Cited by 28 publications

References 13 publications

Calcareous Nannoplankton Changes across the Cretaceous/Paleocene Boundary in the Southern Indian Ocean (Site 750)

Calcareous Nannoplankton Changes across the Cretaceous/Paleocene Boundary in the Southern Indian Ocean (Site 750)

The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

Maastrichtian–Paleocene sequences at Dakhla-Abu Minqar District, Western Desert, Egypt: stratigraphical and paleoenvironmental framework

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