Occurence of foraminifera and other microfossils in sediment core CRP-2/2A (Table 1)

• Main Authors: Strong, C Percy, Webb, Peter-Noel
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: 14.2 km at 096° true from Cape Roberts; Abundance estimate; Ammoelphidiella pustulosa; Ammoelphidiella sp.; Ammoelphidiella uniforamina; Anomalinoides sp.; Bulimina sp.; Cape Roberts Project; Cassidulinoides aequilatera; Cassidulinoides braziliensis; Cassidulinoides chapmani; Cibicides lobatulus; Cibicides refulgens; Cibicides spp.; Core wireline system; Cribroelphidium sp.; CRP; CRP-2; CWS; Depth; bottom/max; top/min; Diatom abundance; Diatom fragments; Echinodermata fragments; Elphidium excavatum group; Elphidium magellanicum; Epistominella exigua; Eponides bradyi; Fissurina bisulcata; Fissurina sp.; Fursenkoina schreibersiana; Lenticulina sp.; Lithologic unit/sequence; Marginulina sp.; Marginulina tumida; Marginulinopsis sp.; Melonis affinis; Melonis barleeanus; Miliolidae; Nodosaria spp.; Nonionella bradii; Nonionella iridea; Nonionella magnalingua; Number of species; off Cape Roberts; Ross Sea; Antarctica; Oolina aqiculata; Cape Roberts; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.183510; https://doi.org/10.1594/PANGAEA.183510

Sparse to moderately abundant foraminiferal assemblages from Oligocene and Lower Miocene sediments in the CRP-2/2A drillhole contain C.27 genera and 42 species of calcareous benthic foraminifera. No planktic or agglutinated taxa were observed. On the basis of their faunal characteristics, four Foraminiferal Units are defined in drillhole succession: Foraminiferal Unit I (26.91-193.95 mbsf), mostly sparse assemblages with Elphidium magellanicum and Cribroelphidium sp.; Foraminiferal Unit II (193.95-342.42 mbsf), mostly moderately abundant assemblages with Cassidulinoides aequilatera and Eponides bradyi; Foraminiferal Unit III (342.42-486.19 mbsf), moderately abundant to sparse assemblages characterised by Cassidulinoides chapmani and Stainforthia sp.; and Foraminiferal Unit IV, Improverished (486.19-624.15, total depth, mbsf), with mostly barren residues, but with large Milioliidae recorded in situ at various horizons in the drill core. Foraminiferal Units I-IV lack taxa allowing correlation to standard zonal schemes. Inspection of faunal records from CIROS-1 and DSDP 270 indicates that, although the faunas show an overall similarity, CRP-2/2A Foraminiferal Units I-IV are not identifiable at these sites. The units are therefore most likely to reflect local environmental changes, and probably will prove useful for local correlation, but their lateral extent is undetermined. All four assemblages apparently represent various glacially-influenced shelf environments, and appear to reflect a long term deepening trend from Units IV to II, from perhaps inner to mid or outer-shelf depths, followed by a return to shallower, inner shelf, conditios for Unit I.