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Wei, Wuchang (1992): Distribution of calcareous nannofossils in the lower sequence of the CIROS-1 sediment core (Table 2) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.758940, Supplement to: Wei, W (1992): Updated nannofossil stratigraphy of the CIROS-1 core from McMurdo Sound (Ross Sea). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 1105-1117, https://doi.org/10.2973/odp.proc.sr.120.197.1992

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Abstract:
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 refinement of the previous nannofossil biostratigraphy, where the interval from 385.77 to 690.40 mbsf was dated as middle Eocene-early Oligocene. Comparison of the nannofossil assemblages in the CIROS-1 core with those in a similar glaciomarine sequence recovered in Prydz Bay (East Antarctica) and those at deep-sea ODP Sites 738 and 744, where lowermost Oligocene ice-rafted debris (IRD) were found, suggests that the nannofossils in the CIROS-1 core samples examined are in situ. The semiquantitative nannofossil data also suggest that Isthmolithus recurvus and Reticulofenestra davies¸ are most tolerant of cold waters within the late Eocene-early Oligocene nannofloras.
Coverage:
Latitude: -77.081872 * Longitude: 164.498860
Date/Time Start: 1986-10-15T00:00:00 * Date/Time End: 1986-11-14T00:00:00
Minimum DEPTH, sediment/rock: 380.00 m * Maximum DEPTH, sediment/rock: 696.61 m
Event(s):
CIROS-1 * Latitude: -77.081872 * Longitude: 164.498860 * Date/Time Start: 1986-10-15T00:00:00 * Date/Time End: 1986-11-14T00:00:00 * Elevation: -197.5 m * Penetration: 702.14 m * Recovery: 660 m * Location: Butter Point * Campaign: CIROS * Basis: Sampling/drilling ice * Method/Device: Drilling/drill rig (DRILL) * Comment: Sea ice thickness 2 m
Comment:
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).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 EpochEpochWei, Wuchang
2 Nannofossil zoneNannos zoneWei, Wuchang
3 DEPTH, sediment/rockDepth sedmGeocode
4 Nannofossil abundanceNannos abundWei, Wuchang
5 Nannofossils preservationNannos preservWei, WuchangG = good, M = moderate
6 Braarudosphaera bigelowiiB. bigelowiiWei, Wuchang
7 Chiasmolithus altusC. altusWei, Wuchang
8 Chiasmolithus oamaruensisC. oamaruensisWei, Wuchang
9 Chiasmolithus cf. oamaruensisC. cf. oamaruensisWei, Wuchang
10 Chiasmolithus sp.Chiasmolithus sp.Wei, Wuchang
11 Coccolithus pelagicusC. pelagicusWei, Wuchang
12 Cyclicargolithus floridanusC. floridanusWei, Wuchang
13 Isthmolithus recurvusI. recurvusWei, Wuchang
14 Lithostromation simplexL. simplexWei, Wuchang
15 Reticulofenestra bisectaR. bisectaWei, Wuchang
16 Reticulofenestra daviesiiR. daviesiiWei, Wuchang
17 Reticulofenestra hillaeR. hillaeWei, Wuchang
18 Reticulofenestra umbilicusR. umbilicusWei, Wuchang
19 Sphenolithus moriformisS. moriformisWei, Wuchang
20 Zygrhablithus bijugatusZ. bijugatusWei, Wuchang
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
850 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Epoch		2 
Nannos zone		3 
Depth sed [m]		4 
Nannos abund		5 
Nannos preserv		6 
B. bigelowii		7 
C. altus		8 
C. oamaruensis		9 
C. cf. oamaruensis		10 
Chiasmolithus sp.		11 
C. pelagicus		12 
C. floridanus		13 
I. recurvus		14 
L. simplex		15 
R. bisecta		16 
R. daviesii		17 
R. hillae		18 
R. umbilicus		19 
S. moriformis		20 
Z. bijugatus
OligoceneChiasmolithus altus380.00FG-R--------F----
OligoceneChiasmolithus altus385.77-X-------XX----
OligoceneChiasmolithus altus389.53XX-------XX--X-
early OligoceneReticulofenestra davisii391.85CGRFRR-R--RRCRR--
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus406.57CG-------C--R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus412.00CGR------C--R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus416.84--X----X-XX---X
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus420.25FG-------F--R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus431.49RM----------R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus441.22B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus450.70X--------XX----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus457.24B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus470.74R----------R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus473.18---------XX----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus491.59B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus495.80----------X----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus501.07B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus518.03RM----------R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus527.97B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus545.87------X--------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus549.37B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus557.55B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus568.22X--------XX----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus570.80B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus580.44B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus597.97B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus602.74B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus607.58X---------X----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus614.86b---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus616.93B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus619.47b---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus635.01X---------X----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus636.76B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus641.09B---------------
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus648.37FGR----R----F----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus654.54X---------X----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus654.72RM----------R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus656.91FG----------F----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus664.31FM----RRRR--F----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus671.01FM----------F----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus675.08RM----------R----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus675.66----------X----
late Eocene - earliest OligoceneIsthmolithus recurvus - Blackites spinosus681.16FM-----FRR-RFR---
??684.32X------X--------
??684.97RM----------R----
??690.40b---------------
??696.61BM---------------