Macrofossils from CRP-2/2A, Victoria Land Basin, Antarctica

• Main Authors: Taviani, M., Beu, A.G., Jonkers, H.A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Museo Nazionale dell'Antartide 2000
• Subjects: Antarctic; East Antarctica; Ross Sea; Victoria Land; McMurdo Sound; Cape Roberts; Antarc*; Antarctica
• Online Access: http://nora.nerc.ac.uk/id/eprint/502521/; http://www.mna.it/english/Publications/TAP/TA_pdfs/Volume_07/04_CRP_2_Scientific_Results_part_2/TA_07_513_Taviani.pdf

CRP-2/2A hole, drilled at 77.006oS and 163.719oE, about 14 km east of Cape Roberts, in the Ross Sea, reached 624 metres below sea floor and recovered a thick Miocene-Oligocene succession capped by a thin Pliocene-Quaternary cover. As many as 324 macrofossiliferous horizons have been identified in core CRP-2/2A, although the poor preservation state of most fossils prevents a full appreciation of their taxonomic identity. The macrofossils identified in core CRP-2/2A belong to Mollusca, Annelida, Cnidaria, Brachiopoda, Bryozoa, Echinodermata, Porifera and Vertebrata and represent an important source of palaeontological information on the former Antarctic biota. In particular, the CRP-2/2A drill core contains the most diverse Oligocene marine invertebrate macrofauna hitherto reported from East Antarctica. Early Miocene and Late Oligocene macrofossil assemblages are consistent with relatively cold (sub-polar) climatic conditions. One of the most significant findings in the drill core CRP-2/2A is the discovery of mussel assemblages dominated by modiolid bivalves within Early Oligocene sediments, suggestive of sea-bottom conditions characterized by high H2S production. Modiolid bivalves are a strong indication of warmer-than-present climatic conditions. Many taxa are comparable to species recovered from coeval sediments drilled in the Ross Sea (DSDP Sites 270 and 272) and McMurdo Sound (CIROS-1).