CALCAREOUS NANNOPLANKTON BIOSTRATIGRAPHY
Quantitative (counting up to 150 specimens per sample) or semi-quantitatives analyses.
From Mesozoic to Present, everywhere in the world.
High-quality biostratigraphic and paleoenvironments interpretations.
CASE STUDY – ANGOLA
Kwanza Basin, Cretaceous – early Campanian
Calcareous nannoplankton identified species :
Ahmuellerella cymbiformis, Ahmuellerella octoradiata, *Aspidolithus parcus constrictus (FO – Early Campanian), Aspidolithus parcus parcus, Braarudosphaera bigelowii, Biscutum constans, Broisonia signata, Calculites obscurus, Chiastozygus litterarius, Corrolithion signum, Cribrosphaerella ehrenbergii, Discorhabdus rotatorius, Eiffellithus eximius, Eiffellithus turriseiffelii, Gartnerago segmentatum, Lucianorhabdus cayeuxii, Lucianorhabdus maleformis, Lithraphidites carniolensis, *Lithastrinus grillii (LO – Early Campanian), Manivitella pemmatoidea, Microrhabdulus belgicus, Microrhabdulus decoratus, Micula concava, Micula decussata, Micula swastica, Prediscosphaera cretacea, Prediscosphaera majungae, Prediscosphaera stoveri, Rhagodiscus angustus, Rhagodiscus splendens, Reinhardtites anthophorus, Tranolithus gabalus, Tranolithus orionatus, Zeugrhabdotus biperforatus, Zeugrhabdotus embergeri, Zeugrhabdotus erectus, Vagalapilla matalosa, Watznaueria barnesiae, Watznaueria ovata.
Preservation : good
Estimated AGE : CRETACEOUS – early CAMPANIAN,
CC18 zone of Sissingh, 1977, respectively UC14 zone of Burnett, 1998.
References
Burnett J.A., 1998. Upper Cretaceous. In: Bown P. R. (ed.) Calcareous nannofossils Biostratigraphy. Chapman & Hall Ltd/Kluwer Academic Press, London, 132-199.
Sissingh W., 1977. Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw 56 (1), 37–65.
SELECTED SPECIES
Myanmar, Salin Basin
Selected calcareous nannoplankton identified species:
1. Isthmolithus recurvus, N+; 2. Reticulofenestra lockerii, N+; 3.Reticulofenestra hillae, N+; 4. Reticulofenestra reticulata, N+; 5. Chiasmolithus gigas, N+; 6. Fasciculithus tympaniformis, N+; 7. Heliolithuskleinpellii, N+; 8. Heliolithus kleinpellii, NII; 9. Helicosphaera ethologa, N+; 10. Reticulofenestra umbilicus, N+; 11. Reticulofenestra reticulata, N+; 12. Reticulofenestra bisecta, N+; 13. Sphenolithus conicus, N+; 14. Sphenolithus conicus, N+; 15. Cyclicargolithus abisectus, N+; 16. Calcidiscus leptoporus, N+; 17. Sphenolithus conicus, N+; 18. Sphenolithus conicus, N+; 19. Calcidiscus leptoporus, NII; 20. Helicosphaera carteri, N+; 21. Cyclicargolithus abisectus, N+; 22. Triquetrorhabdulus carinatus, N+; 23. Reticulofenestra umbilica, N+; 24. Reticulofenestra reticulata, N+; 25. Isthmolithus recurvus N+.