Radiolarian BIOSTRATIGRAPHY
Quantitative (counting up to 200 specimens) or semi-quantitatives analyses.
From Mesozoic to Cenozoic, everywhere in the world.
High-quality biostratigraphic and paleoenvironments interpretations.
Interpretation of recorded species is based on the global and/or regional biostratigraphic charts.
CASE STUDY
Middle Jurasic, Bajocian -Bathonian
Radiolarian species from studied sample :
Archaeodictyomitra rigida, A. suzuki, Archaeodictyomitra sp., Canoptum krahsteinense, *Dictyomitrella kamoensis (1), Eoxitus baloghi, *Eucyrtidiellum semifactum (2), *Eucyrtidiellum unumaense dentatum (3), Helvetocapsa matsuokai, *Hemicryptocapsa marcucciae (4), Hemicryptocapsa yaoi, *Paronatella broennimanni (5), Praewilliridellum sp. aff. P. convexum, Praewilliridellum sp. aff. P. himerdaruma, Protunuma lanosus, Quarticella sp., *Semihsuum amabile (6), Stichocapsa(?) magnipora, *Stichocapsa(?) takanoensis, *Striatojaponocapsa synconexa (7),*Transhsuum brevicostratum (8), *Transhsuum maxwelli, Triactoma (?)sp., Unuma sp., *Unuma gordus (9), *Unuma latusicostatus, Yaocapsa sp. A.
ESTIMATED AGE : Middle JURASSIC, Bajocian-Bathonian
UAZ 5 biozone (Baumgartner et al., 1995).
BIOSTRATIGRAPHY CHART
Plio-Pleistocene, Eastern Equatorial Pacific
Selected radiolarian species
Biostratigraphic records are based on scientific publications (Geobiostratdata – database)
References:
Lazarus D., Spencer−Cervato C., Pika−Biolzi,M., Beckmann J.P., Von Salis K., Hilbrecht H., Thierstein H. 1995. Revised chronology of Neogene DSDP Holes from the world ocean. Ocean Drilling Program Technical Note 24: 1–301.
Sanfilippo A., Nigrini C. 1998. Code numbers for Cenozoic low latitude radiolarian biostratigraphic zones and GPTS conversion tables. Marine Micropaleontology 33: 109–156.
Kamikuri S-I., Motoyama I., Nishi H., Iwai M., 2009. Neogene radiolarian biostratigraphy and faunal evolution rates in the eastern equatorial Pacific ODP Sites 845 and 1241. Acta paleontological Polonica, 54 (4): 713-742.