Distribution of calcareous nannofossils in the lower sequence of the CIROS-1 sediment core (Table 2) ...

Semiquantitative data of calcareous nannofossil species abundance were collected for 31 samples from 380.00 to 696.61 m below sea floor (mbsf) in the CIROS-1 core from the western McMurdo Sound (Ross Sea). This core has provided the most complete record of Paleogene glacial history of Antarctica. On...

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Bibliographic Details
Main Author: Wei, Wuchang
Format: Dataset
Language:English
Published: PANGAEA 1992
Subjects:
Epoch
Nannofossil zone
DEPTH, sediment/rock
Nannofossil abundance
Nannofossils preservation
Braarudosphaera bigelowii
Chiasmolithus altus
Chiasmolithus oamaruensis
Chiasmolithus cf. oamaruensis
Chiasmolithus sp.
Coccolithus pelagicus
Cyclicargolithus floridanus
Isthmolithus recurvus
Lithostromation simplex
Reticulofenestra bisecta
Reticulofenestra daviesii
Reticulofenestra hillae
Reticulofenestra umbilicus
Sphenolithus moriformis
Zygrhablithus bijugatus
Drilling/drill rig
CIROS
Sampling/drilling ice
McMurdo Sound
Ross Sea
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.758940
https://doi.pangaea.de/10.1594/PANGAEA.758940
Description
Summary:Semiquantitative data of calcareous nannofossil species abundance were collected for 31 samples from 380.00 to 696.61 m below sea floor (mbsf) in the CIROS-1 core from the western McMurdo Sound (Ross Sea). This core has provided the most complete record of Paleogene glacial history of Antarctica. Only half of the samples yielded calcareous nannofossils and species diversity is generally low. However, several samples contain diverse assemblages and nannofossil zonal markers. Isthmolithus recurvus was found between 406.57 and 681.16 mbsf. This species has an age range of ~35-39 Ma in the mid to high latitudes, as calibrated previously by magnetostratigraphy at a number of DSDP/ODP sites. The interval from 406.57 to 681.16 mbsf can be assigned to the late Eocene-earliest Oligocene (~35-39 Ma), and the sample at 391.85 mbsf, which still contains Reticulofenestra hillae and Reticulofenestra umbilica but does not contain I. recurvus, is identified as early Oligocene age (~33-34 Ma). This represents an age ... : Nannofossil zones are given according to the southern high-latitude zonation of Wei and Wise (1990, doi:10.2973/odp.proc.sr.113.125.1990). For abundance of nannofossils, C = common, F = few, R = rare, B = barren, X = presence as reported by Edwards and Waghorn (1989), and b = barren as reported by Edwards and Waghorn (1989). ...

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