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Lozar, Francesca; Mussa, Massimo (2003): (Table 1) Silicoflagellate abundance in ODP Hole 186-1149A sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.783924, Supplement to: Lozar, F; Mussa, M (2003): Silicoflagellate biostratigraphy, Hole 1149A (ODP Leg 185, Nadezhda Basin, northwestern Pacific). In: Ludden, JN; Plank, T; Escutia, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 185, 1-18, https://doi.org/10.2973/odp.proc.sr.185.009.2003

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Abstract:
Silicoflagellate assemblages have been studied from Hole 1149A (northwestern Pacific, Ocean Drilling Program Leg 185) in a continuous record of pelagic clay from lithologic Unit I. The biostratigraphic framework of D. Bukry, adapted in this work, is calibrated to tropical and subtropical fossil floras. Four biozones and three subzones have been recognized (from the lower Pliocene Dictyocha fibula Zone to the Quaternary Dictyocha aculeata aculeata Zone), and their zonal boundaries have been calibrated to the magnetostratigraphic scale. In particular, the boundary between the Dictyocha perlaevis delicata and the Dictyocha perlaevis ornata Subzones approximates the Pliocene/Pleistocene boundary.
The identification of three closely spaced climatic events (the asperoid/fibuloid reversal at 75.11 meters below seafloor [mbsf], the sharp decrease in abundance of Distephanus sp. at 70.05 mbsf, and the last occurrence of Distephanus boliviensis at 68.46 mbsf) indicates the increased strength of the warm Kuroshio Current in the interval between 3.3 and 2.8 Ma, due to the final closure of the Central American Seaway and leading to the present-day hydrodynamic regime. The beginning of the acme of Mesocena quadrangula at 37.01 mbsf (~1.1 Ma) also shows a sharp warming in surface waters.
Related to:
Baccelle, Lucia; Bosellini, Alfonso (1965): Diagrammi per la stima visiva della composizione percentuale nelle rocce sedimentarie. Università degli studi di Ferrara, Annali. Nuova ser. Sez. IX: Scienze geologiche e paleontologiche, 59-62
Project(s):
Coverage:
Latitude: 31.342000 * Longitude: 143.351300
Date/Time Start: 1999-05-23T15:00:00 * Date/Time End: 1999-05-26T07:25:00
Minimum DEPTH, sediment/rock: 1.12 m * Maximum DEPTH, sediment/rock: 98.60 m
Event(s):
185-1149A * Latitude: 31.342000 * Longitude: 143.351300 * Date/Time Start: 1999-05-23T15:00:00 * Date/Time End: 1999-05-26T07:25:00 * Elevation: -5817.6 m * Penetration: 191.2 m * Recovery: 174.44 m * Location: North Pacific Ocean * Campaign: Leg185 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 191.2 m cored; 0 m drilled; 91.2 % recovery
Comment:
Sediment depth is given in mbsf. Sample observation was performed under a polarizing light microscope at 400x magnification. Abundance estimate as follows: A = abundant, C = common, F = few, R = rare, VR = very rare, - not found.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelLozar, FrancescaODP sample designation
2DEPTH, sediment/rockDepthmGeocode
3Organic matterOMLozar, Francesca
4BiogenicBiogenicLozar, Francesca
5Volcanic glassVolc glassLozar, FrancescaN = absent, S = present (<15% of fine fraction), A = abundant (>15% of fine fraction)
6Corbisema triacanthaC. triacanthaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
7Dictyocha aculeata aculeataD. aculeata aculeataLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
8Dictyocha aculeata subaculeataD. aculeata subaculeataLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
9Dictyocha aspera asperaD. aspera asperaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
10Dictyocha brevispina ausoniaD. brevispina ausoniaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
11Dictyocha brevispina brevispinaD. brevispina brevispinaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
12Dictyocha calida ampliataD. calida ampliataLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
13Dictyocha calida calidaD. calida calidaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
14Dictyocha fibulaD. fibulaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
15Dictyocha lingiiD. lingiiLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
16Dictyocha longaD. longaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
17Dictyocha pentagonaD. pentagonaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
18Dictyocha perlaevis delicataD. perlaevis delicataLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
19Dictyocha perlaevis flexatellaD. perlaevis flexatellaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
20Dictyocha perlaevis ornataD. perlaevis ornataLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
21Dictyocha perlaevis perlaevisD. perlaevis perlaevisLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
22Dictyocha pulchellaD. pulchellaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
23Dictyocha stapedia aspinosaD. stapedia aspinosaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
24Dictyocha stapedia stapediaD. stapedia stapediaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
25Distephanus boliviensisD. boliviensisLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
26Distephanus cruxD. cruxLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)s.l.
27Distephanus octangulatusD. octangulatusLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
28Distephanus speculum minutusD. speculum minutusLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
29Distephanus speculum pentagonusD. speculum pentagonusLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
30Distephanus speculum speculumD. speculum speculumLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
31Mesocena circulusM. circulusLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
32Mesocena ellipticaM. ellipticaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
33Mesocena quadrangulaM. quadrangulaLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)
34Silicoflagellates, aberrantSilicoflagellates aberrantLozar, FrancescaAbundance estimate, Baccelle and Bosellini (1965)C = common (>1 specimen per 50-100 FOV), F = few (1 specimen per 50-100 FOV), R = rare (1 specimen per 100-200 FOV), N = absent
Size:
1419 data points

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