Calcareous nannofossils from the Upper Cretaceous of northern James Ross Island, Antarctica: a pilot study

Authors

  • Lilian Švábenická Czech Geological Survey
  • Radek Vodrážka Czech Geological Survey
  • Daniel Nývlt Czech Geological Survey

DOI:

https://doi.org/10.7306/gq.1053

Keywords:

Antarctica, James Ross Island, Upper Cretaceous, calcareous nannofossils, biostratigraphy

Abstract

The Czech scientific expedition to northern James Ross Island, Antarctica has tested the use of calcareous nannofossils as a possible tool for stratigraphic correlation of Cretaceous and Neogene strata. Only a few samples with poor nannofossil content gave useful information for biostratigraphy. The Lower Campanian Chiastozygus garrisonii Zone and Gephyrobiscutum diabolum Subzone, respectively, was established in the lower part of the Santa Marta Formation, Lachman Crags Member, from the common occurrence of Gephyrobiscutum diabolum associated with Broinsonia parca parca and Acuturris scotus. Deposits of the Late Miocene Mendel Formation yielded exclusively reworked nannofossils from the older Upper Cretaceous deposits. Nannofossils indicate at least two distinct stratigraphic levels: Middle Coniacian and Santonian–basal Campanian, and these must have been sourced from the immediate area. The majority of the marine deposit samples studied were barren of nannofossils, probably due to late diagenetic secondary decalcification. 

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Published

2012-09-27

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Articles