CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina siakensis LeRoy 1939
This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Citation: Globigerina siakensis LeRoy 1939Rank: speciesType specimens: No. P. S. 1075 a.Type sample (& lithostrat): Transitional Zone Sand and Clay SeriesType age (chronostrat): Neogene, Miocene (?)Type locality: Locality Ho-528, 5 km. N. 33° E. from kampong Aliantan, Tapoeng Kiri area, Rokan-Tapanoeli Region (approximately between north latitudes 0° 30' and 1°50' and east longitudes 99°40' and 101°30' ), Central Sumatra, Netherlands Indies; auger hole sample, depth 3 metersType repository: Bandung; Deposited in the collections of the Geological Museum at Bandoeag, Java;
Original Description Test medium, periphery well rounded, strongly lobulate, closely coiled in early stage, dorsally rather flat but more convex ventrally; chambers distinct, five to six in last whorl, inflated, particularly last two or three, arranged in a flattened spiral fashion; sutures distinct, depressed, straight, radial both ventrally and dorsally; aperture a large opening at base of last chamber, opens ventrally and extends into umbilical region, a distinct lip projects from the upper part. Size: Diameter 0.4 mm.; thickness 0.28 mm. Etymology: Extra details from original publication This species is present in great abundance throughout the Central Sumatran Tertiary. It is well developed in the Telisa Editors' Notes
References:
Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs
Leckie, R. M. et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. gsVO
LeRoy, L. W. (1939). Some small foraminifera ostracoda and otoliths from the Neogene (Miocene) of the Rokan-Tapanoeli area, central Sumatra,. Natuurkunde Tijdschrift voor Nederlandsch-Indië. 99(6): 215-296. gs
Globigerina siakensis compiled by the pforams@mikrotax project teamviewed: 5-2-2023
Blow 1969 pl10 f07-9.JPG
Olig Atlas pl05-11 01-3.JPG
siakensis_holo-illus.jpg
Blow 1969 pl10 f07-9.JPG
Olig Atlas pl05-11 01-3.JPG
siakensis_holo-illus.jpg
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