Pontosphaera sparsiforata

(Kamptner, 1948) Roth, 1970 Sep 09, 2020

Set number: 1890

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DSDP Leg 23, Site 225, Red Sea

Set number: 1891

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DSDP Leg 23, Site 225, Red Sea

Set number: 1892

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DSDP Leg 23, Site 225, Red Sea

Set number: 1893

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DSDP Leg 23, Site 225, Red Sea

Set number: 1179

Pontosphaera sparsiforata, Late Miocene, Adana Basin, Turkey

Fig 1. 12.1µm; Fig 2. 9.0µm; Fig 3. 13.6µm

Set number: 1895

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DSDP Leg 23, Site 225, Red Sea

Set number: 1894

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10µm

DSDP Leg 23, Site 225, Red Sea

Set number: 1889

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DSDP Leg 23, Site 225, Red Sea

Final Epithet

Pontosphaera sparsiforata (Kamptner, 1948) Roth, 1970

Basionym

Discolithus sparsiforatus Kamptner, 1948

Synonyms

Pontosphaera sparsiforatus (Kamptner, 1948) Varol, 1989a

Remarks

Large species of Pontosphaera feature a relatively high wall and a proximal plate with a very thin distal cover. As a result, the interference colour of the central area is much weaker than that of the wall when viewed in plan in XPL. The proximal plate is perforated by pores arranged in a single complete concentric cycle, with additional randomly arranged pores possibly located in the centre. Pontosphaera sparsiforata exhibits laevogyre-inclined extinction lines, with a typical extinction angle of approximately 67° on the distal side and displays length-fast (−) elongation.

Pontosphaera sparsiforata can be distinguished from Pontosphaera trena by its larger size, being greater than 10.0 μm.

References

Kamptner, E. 1948. Coccolithen aus dem Torton des Inneralpinen Wiener Beckens. Anzeiger der Österreichische Akademie der Wissenschaften, Mathematische-Naturwissenschafliche Klasse, Wien. 157: 1-16.

Roth, P. H. 1970. Oligocene calcareous nannoplankton biostratigraphy. Eclogae Geologicae Helvetiae 63: 799-881.

Varol, O. 1989a. Calcareous nannofossil study of the central and western Solomon Islands. In: Vedder, J.G. & Bruns, T.R., (Eds.), Geology and offshore resources of Pacific island arc-Solomon Islands and Bougainville, Papua New Guinea Regions: Houston, Texas, Circum-Pacific Council for Energy and Mineral Resources Earth Sciences Series. 12: 239-268.

Taxonomy

Pontosphaera

Biostratigraphy

Stratigraphic Range

Tortonian

Age (Ma)

11.63? - 7.25?

Holotype

Discolithus sparsiforatus Kamptner, 1948

Late Miocene

Inner alpine Vienna basin