Measured coccolith-size data of the Genus Gephyrocapsa in the Quaternary Sequence of the Tropical Indian Ocean, ODP Hole 115-709C


Stratigraphic variations in the morphometry of the genus Gephyrocapsa were quantitatively investigated in the Quaternary sequence of ODP Hole 115-709C recovered from the tropical Indian Ocean. This is raw data of the measurement.

The first 200 specimens of Gephyrocapsa species were measured for the overall size of the coccolith, the diameter of the central opening, and the angle of the central bridge vs. the long axis of the coccolith. The two lengths were measured to 0.1 µm precision. Because the bridge angle is difficult to measure precisely under a transmission microscope, it was classified into six categories:1 (0° - 15°), 2 (15° - 30°), 3 (30° - 45°), 4 (45° - 60°), 5 (60° - 75°), and 6 (75° - 90°). The angle of the central bridge on 0° means parallel to long axis of the coccolith. For those samples in which the small forms dominated the flora and the large forms were scarce, additional measurements were conducted exclusively for the large forms to obtain a sufficient data set.

Supplement to: Matsuoka, Hiromi; Okada, Hisatake (1990): Time-progressive morphometric changes of the genus Gephyrocapsa in the Quaternary sequence of the tropical Indian Ocean, Site 709. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 255-270

Related Identifier
Metadata Access
Creator Matsuoka, Hiromi; Okada, Hisatake
Publisher PANGAEA
Publication Year 2019
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 38360 data points
Discipline Earth System Research
Spatial Coverage (60.552 LON, -3.915 LAT); South Indian Ridge, South Indian Ocean
Temporal Coverage Begin 1987-05-07T04:00:00Z
Temporal Coverage End 1987-06-08T17:00:00Z