Stoverius achylosus


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Stoverius -> Stoverius achylosus
Sister taxa: S. achylosus, S. acutus, S. coangustatus, S. protosignum, S. sp.,

Distinguishing features: Coccoliths with low, elliptical to circular protolith rim with wide central area spanned by spanned by cross bars that meet at a high angle. Rim image is bicyclic in XPL.


Taxonomy:

Citation: Stoverius achylosus (Stover, 1966) Perch-Nielsen, 1986
Rank: Species
Basionym: Chiphragmalithus achylosus Stover, 1966
Variants: Stoverius baldiae (Stradner & Adamiker, 1966) Perch-Nielsen, 1984 [basionym Zygolithus baldiae]- crossbars diagonal rather than axial. Most authors include specimens with a range of bar orientiations in S. achylosus. Perch-Nielsen (1985) however separated forms with axial bars as S. achylosus and with diagonal bars as S. baldiae
Synonyms: Corollithion achylosum (Stover 1966) Thierstein 1971

Farinacci & Howe catalog pages: Chiphragmalithus achylosus * , Zygolithus baldiae *

Distinguishing features: Coccoliths with low, elliptical to circular protolith rim with wide central area spanned by spanned by cross bars that meet at a high angle. Rim image is bicyclic in XPL.

Geological Range:
Notes: In the Indian Ocean LO seen in UC7 (Burnett 1998)
Last occurrence (top): in mid part of UC9a subzone (50% up, 91.2Ma, in Turonian stage). Data source: Burnett 1998, fig. 6.3
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Bown et al. 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Stoverius achylosus, synonyms included - Corollithion achylosum; Corollithion achylosus; Stoverius achylosus; Stoverius baldiae; Zygolithus achylosus; space-time plot :: Samples map :: Parent: Stoverius

    References:

    Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

    Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-82. gs

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs

    Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

    Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

    Lambert, B. (1993). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional (Deuxième Partie). Cahiers de Micropaleontologie. 8(2): 183-225. gs

    Mutterlose, J. (1992b). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program. Scientific Results. 123: 343-368. gs

    Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs

    Perch-Nielsen, K. (1985b). Mesozoic calcareous nannofossils. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 329-426. gs

    Perch-Nielsen, K. (1986). New Mesozoic and Paleogene calcareous nannofossils. Eclogae Geologicae Helvetiae. 79(3): 835-847. gs

    Stover, L. E. (1966). Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology. 12: 133-167. gs

    Stradner, H. & Adamiker, D. (1966). Nannofossilien aus Bohrkernen und ihre elektronenmikroskopische Bearbeitung. Erdoel-Erdgas Zeitschrift. 82: 330-341. gs

    Thierstein, H. R. (1971). Tentative Lower Cretaceous Calcareous Nannoplankton Zonation. Eclogae Geologicae Helvetiae. 64: 459-488. gs

    Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs


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    Stoverius achylosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-9-2019

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