Cyclagelosphaera argoensis

Bown, 1992 Jul 13, 2026

Set number: 3362

  • Cyclagelosphaera argoensis 12706 1
  • Cyclagelosphaera argoensis 12707 2
  • Cyclagelosphaera argoensis 12709 3
  • Cyclagelosphaera argoensis 12708 4
    10µm
Cyclagelosphaera argoensis, Early Berriasian, DSDP Leg 76, Site 534A, Blake-Bahama Basin, Atlantic Ocean

Set number: 3361

  • Cyclagelosphaera argoensis 12637 1
  • Cyclagelosphaera argoensis 12638 2
  • Cyclagelosphaera argoensis 12640 3
  • Cyclagelosphaera argoensis 12639 4
    10µm
Cyclagelosphaera argoensis, Late Tithonian, DSDP Leg 76, Site 534A, Blake-Bahama Basin, Atlantic Ocean
Final Epithet
Cyclagelosphaera argoensis Bown, 1992
Description

Large species of Cyclagelosphaera are characterised by a very broad outer tube cycle and a very narrow inner tube cycle surrounding a minute central opening.

References

Bown, P. R. 1992. New calcareous nannofossil taxa from the Jurassic/Cretaceous boundary interval of Sites 765 and 261, Argo Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 123: 369-379.

Taxonomy
Cyclagelosphaera
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Early Cretaceous
          • Neocomian
            • Hauterivian
              • Late Hauterivian
      • Jurassic
        • Late Jurassic
          • Malm
            • Tithonian
              • Early Tithonian
Stratigraphic Range
Early Tithonian - Late Hauterivian
Age (Ma)
149.24? - 126.50?
Holotype
Cyclagelosphaera argoensis 12637

Cyclagelosphaera argoensis Bown, 1992

Tithonian

DSDP Leg 27, Site 261, Argo Abyssal Plain, off the northwest shelf of Australia.