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Early Bartonian orthophragminids (Foraminiferida) from Reineche Limestone, north African platform, Tunisia: taxonomy and paleobiogeographic implications

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Title Early Bartonian orthophragminids (Foraminiferida) from Reineche Limestone, north African platform, Tunisia: taxonomy and paleobiogeographic implications
 
Creator BEN ISMAIL-LATTRACHE, K
OZCAN, E
BOUKHALFA, K
SARASWATI, PK
SOUSSI, M
JOVANE, L
 
Subject orthophragminids
taxonomy
paleobiogeography
early Bartonian
Reineche Limestone
Tunisia
LARGER FORAMINIFERA
WESTERN TETHYS
SHALLOW-MARINE
THRACE BASIN
NW TURKEY
EOCENE
EVOLUTION
MIDDLE
BIOSTRATIGRAPHY
BOUNDARY
 
Description The orthophragminids in lower Bartonian Reineche Limestone member, a fossiliferous shallow-marine unit exposed in Cap Bon peninsula in Tunisia, are represented by 17 species assigned to Discocyclinidae Galloway 1928 and Orbitoclypeidae Bronnimann 1946. These taxa, associated with nummulitids and alveolinids, belong to the lineages of Discocyclina Gumbel 1870, Nemkovella, 1987, Orbitoclypeus Silvestri 1907, and Asterocyclina Gumbel 1870, described for the first time from north Africa lying at the southern margin of Tethyan ocean during Paleogene. We identified Nemkovella evae, previously not recorded in upper Lutetian/lower Bartonian and younger Eocene deposits of northern Tethyan platforms, and erected a new subspecies, N. evae reinechensis n. ssp. A comparison of Reineche orthophraminids, assigned to orthophragmines zone (OZ) 12 and shallow benthic zone (SBZ 17), to the well-described coeval assemblages at northern Tethyan platforms in Italy, Hungary, Turkey, and to those in Kutch Basin in the Indian subcontinent suggests that some species are confined to certain paleogeographic domains. Orbitoclypeus haynesi, the only orbitoclypeid and the most abundant orthophragminid in lower Bartonian deposits in Kutch, appears to be the most common orbitoclypeid in Reineche Limestone. In Europe, this species is not known and is replaced by Orbitoclypeus varians, the most common orbitoclypeid in middle Eocene of central Europe. Both species occur in varying proportions in marine successions in Turkey. Asterocyclina sireli, identified so far only in Turkey, occurs in Reineche Limestone and in lower Bartonian deposits in Kutch. This species is recorded for the first time in the Indian subcontinent. Relying on present study, as well as our recent studies in Kutch Basin, we conclude that the generic and specific diversity of orthophragminids decreases eastward from the peri-Mediterranean region to Indian subcontinent and to the western Pacific.
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2014-10-17T04:56:47Z
2014-10-17T04:56:47Z
2013
 
Type Article
 
Identifier GEODINAMICA ACTA, 26(1-2)94-121
0985-3111
1778-3593
http://dx.doi.org/10.1080/09853111.2013.858950
http://dspace.library.iitb.ac.in/jspui/handle/100/16005
 
Language en