Distinguishing features: Large sized (>8µm) with a narrow rim (<1.5µm)
Taxonomy:
Discolithus octocentralis Stover (1966) [cf. Reinhardt 1967]
Farinacci & Howe catalog pages: Arkhangelskiella cymbiformis + + * , Arkhangelskiella cymbiformis NT * , Discolithus octocentralis *
Distinguishing features: Large sized (>8µm) with a narrow rim (<1.5µm)
Morphology remarks: According to Varol (1989) this form, which he termed A. cymbiformis NT has a thin rim as well as a narrow rim and this reflected in the outer half of the rim being less bright than the rest.
Geological Range:
Notes: Linnert & Mutterlose (2009) show that the mean length of Arkhangellskiella specimens is about 6.5-7µm through the Campanain but 8-9 µm in the Maastrichtian - base on a study of DSDP site 390 (Blake Nose, NW Atlantic).
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): at base of UC13 zone (0% up, 83.2Ma, in Campanian stage). Data source: Burnett 1998 (zonal marker)
Plot of occurrence data:
Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs Cepek, P. (1978). Mesozoic calcareous nannoplankton of the Eastern North Atlantic, Leg 41. Initial Reports of the Deep Sea Drilling Project. 41: 667-687. gs Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-60. gs Linnert, C. & Mutterlose, J. (2009). Biometry of the Late Cretaceous Arkhangelskiella group: ecophenotypes controlled by nutrient flux. Cretaceous Research. 30: 1193-1204. gs Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. gs Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program. Scientific Results. 113: 465-487. gs Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program. Scientific Results. 113: 515-532. gs Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 30(1): 39-56. gs Varol, O. (1989d). Quantitative analysis of the Arkhangelskiella cymbiformis group and its biostratigraphical usefulness in the North Sea area. Journal of Micropalaeontology. 8: 131-134. gs Vekshina, V. N. (1959). Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Siberian Science Research Institute of Geology Geophysics Mineralogy and Raw Materials. 2: 56-81. gsReferences:
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Arkhangelskiella cymbiformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-12-2019
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