Calcareous nannofossils from Cape Roberts Project drillhole CRP-3 Victoria Land Basin, Antarctica

摘要: Fossil specimens of the exclusively oceanic calcareous nannoplankton were found only in upper 200 m Cape Roberts Project 3 (CRP-3) cores. These assemblages are depauperate and sporadic occurrence. The majority contain fewer than 4 species, indicating a severe palaeoecological restriction. clear domination these by reticulofenestrid coupled with almost total exclusion Coccolithus pelagicus, indicates cold surface water conditions Victoria Land Basin during lives poor algae. conditions, perhaps abnormal chemistry, excluded all age-diagnostic species from area. occurrence Transversopontis pulcheroides, however, suggests biostratigraphic assignment lower Oligocene for this part core. CRP-3 occur within fine-grained clastic sedimentary rocks, but those that close stratigraphical proximity coarser-grained lithologies.