Citation:

PANGAEA.993418 (DOI registration in progress)

Name: Calcareous nannofossil assemblages in sediment core GeoB2908-7
Creator: Karl-Heinz Baumann
Published: 2026-04-07
License: https://creativecommons.org/licenses/by/4.0/
Keywords: coccolith abundances; Coccoliths; Equatorial Atlantic

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Published: 2026-04-07

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Abstract:

The calcareous nannofossil assemblages from sediment core GeoB2908-7 from the equatorial Atlantic were examined to document oceanographic changes in surface waters during the last 365 ka. Coccolith counts were made manually on filtered samples using a Zeiss DSM 940A scanning electron microscope at 3,000x or 5,000x magnification. The surface water circulation of the equatorial Atlantic has changed drastically, as can be seen from changes in the coccolithophore species composition and absolute coccolith abundances.

Keyword(s):

coccolith abundances; Coccoliths; Equatorial Atlantic

Coverage:

Latitude: 0.106667 * Longitude: -23.326667

Date/Time Start: 1994-08-24T00:00:00 * Date/Time End: 1994-08-24T00:00:00

Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 10.73 m

Event(s):

GeoB2908-7 * Latitude: 0.106667 * Longitude: -23.326667 * Date/Time: 1994-08-24T00:00:00 * Elevation: -3809.0 m * Recovery: 10.94 m * Location: Western Equatorial Atlantic * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz		Geocode
2	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
3	Coccoliths, total	Cocco	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
4	Calciosolenia spp.	Calciosolenia spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
5	Calcidiscus leptoporus	C. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
6	Coccolithus braarudii	C. braarudii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
7	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
8	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
9	Gephyrocapsa caribbeanica	G. caribbeanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Hayaster perplexus	H. perplexus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Rhabdosphaera spp.	Rhabdosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
21	Syracosphaera spp.	Syracosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Coccoliths, other	Cocco oth	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2184 data points

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