Pontosphaera rimosa

(Bramlette & Sullivan, 1961) Roth & Thierstein, 1972 Jun 13, 2025

Set number: 1902

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10µm

Pontosphaera rimosa, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

In the mobile mount.

Set number: 1903

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10µm

Pontosphaera rimosa, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 1901

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10µm

Pontosphaera rimosa, Late Paleocene, DSDP Leg 25, Site 245, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 1904

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10µm

Pontosphaera rimosa, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 1905

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10µm

Pontosphaera rimosa, Late Paleocene, Santos Basin, Brazil

Final Epithet

Pontosphaera rimosa (Bramlette & Sullivan, 1961) Roth & Thierstein, 1972

Basionym

Discolithus rimosus Bramlette & Sullivan, 1961

Remarks

Pontosphaera rimosa consists of a wall and a proximal plate, with a thin distal cover pierced by a single large pore. The species exhibits dextrally inclined extinction lines, with a typical extinction angle of approximately 65°

References

Roth, P. H. & Thierstein, H. R. 1972. Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559.

Bramlette, M. N. & Sullivan, F. R. 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2): 129-188.

Taxonomy

Pontosphaera

Biostratigraphy

Stratigraphic Range

Thanetian - Lutetian

Zone(s)

NP8 - NP15

Age (Ma)

59.24? - 41.03?

Holotype

Discolithus rimosus Bramlette & Sullivan, 1961

Late Paleocene

Lodo section, northwestern Fresno County, central California, USA