The benthic foraminiferal biostratigraphy of Oligo-Miocene aged Muratlı and Petekkaya formations which crop out over wide regions around Akçadağ town, west of Malatya province in Eastern Taurids were revealed in this study. Systematical sampling was carried out in measured stratigraphical sections in four locations in order to perform stratigraphical and paleontological investigations. Benthic foraminifera taken from 182 hard rock samples were defined and three biozones were determined as; SBZ 21-22, belonging to Oligocene (Rupelian -Early Chattian), SBZ 23 (Late Chattian) and SBZ 25 belonging to Lower Miocene in shallow marine deposits in the region. It was stated that the assemblage of planktic foraminifer and nannoplankton which stratigraphically detected within Chattian -Burdigalian units in the succession most probably indicated Aquitanian age. Besides; Oligo-Miocene transition in the region was approved with this study based on biostratigraphical locations of benthic foraminiferal taxa.
In this study, systematic description of 28 benthic foraminiferal taxa were carried out which had been detected in Oligo-Miocene aged Muratl› and Petekkaya formations cropping out over wide areas around Akçada¤ town, west of Malatya province in Eastern Taurids. Miogypsina globulina which is a cosmopolite species located in Burdigalian aged shallow marine carbonates is described on wide geographical areas ranging from Central America to Indo-Pacific and Mediterranean Tethys. Miogypsina polymorpha on the other hand was reported only from Indo-Pacific in stratigraphical records until today. Considering the association of these species, the assumption of a probable marine connection mentioned between Indo-Pacific and Mediterranean Tethys in Burdigalian period in the region was strongly supported. Also considering the presence of marker planktonic foraminiferal species Globoquadrina dehiscens and Sphenolithus delphix from nannoplanktons which are described in marls between Chattian and Burdigalian units it was determined that these marls most probably indicated Aquitanian age.
ÖZBu çalışma ile, Doğu Toroslar'da Malatya ilinin batısındaki Akçadağ ilçesi civarında geniş alanlarda yüzeyleyen Oligo-Miyosen yaşlı Muratlı ve Petekkaya formasyonlarının bentik foraminifer biyostratigrafisi ortaya konulmuştur. Bölgede, stratigrafik ve paleontolojik incelemeler yapmak üzere seçilen dört lokasyondaki ölçülü stratigrafik kesitte sistematik örnek alımı gerçekleştirilmiştir. Toplam 182 adet sert kayaç örneğinden elde edilen bentik foraminiferler tanımlanarak bölgedeki sığ denizel çökellerde Oligosen'e ait SBZ 21-22 (RupeliyenErken Şattiyen), SBZ 23 (Geç Şattiyen) ile Alt Miyosen'e ait SBZ-25 olmak üzere toplam üç biyozon saptanmıştır. İstifte stratigrafik olarak Şattiyen ile Burdigaliyen yaşlı birimler arasındaki marnlarda tespit edilen planktik foraminifer ve nannoplankton topluluğunun olasılıkla Akitaniyen yaşını işaret ettiği belirlenmiştir. Ayrıca bu çalışma ile, bentik foraminifer taksonlarının biyostratigrafik konumlarına dayanarak bölgede Oligo-Miyosen geçişi belgelenmiştir.
ABSTRACT
The benthic foraminiferal biostratigraphy of Oligo-Miocene aged Muratlı and Petekkaya formations which crop out over wide regions around Akçadağ town, west of Malatya province in Eastern Taurids
The genus Neoplanorbulinella Matsumaru, 1976 was firstly identified in the Lower Miocene of Saipan and Mariana Islands in the Western Pacific. The present paper reports on its occurrence in the Lower Oligocene of Malatya Basin (Eastern Taurids, East Turkey). Neoplanorbulinella is characterized by a conical test, having several sized equatorial chambers irregularly arranged around the cone, and lateral chambers underdeveloped in umbilical cavity. The new planorbulinid species, namely Neoplanorbulinella matsumarui n. sp. and Neoplanorbulinella malatyaensis n. sp., are recorded in the Muratlı Formation (Malatya Basin, Turkey), which is dated to the Rupelian-early Chattian. The new species are associated to an assemblage of the SB 21-22 larger foraminiferal zone. The new species are described, and their affinities are discussed.
This study focuses on the Oligocene successions that contain predominantly siliciclastic, limestones with larger benthic foraminifera in the Burdur Basin of southwest Anatolia, Turkey. The Burdur-1 and Burdur-2 sections in the Oligocene deposits are described sedimentologically and were sampled for lithology, biostratigraphy, microfacies analysis and fossil content. Larger benthic foraminifera were mainly recovered from limestones in the upper part of the Burdur-2 section. Thin-section analysis of the larger benthic foraminiferal assemblage reveals that the upper part of the Burdur-2 section includes Nummulites fichteli Michelotti, 1841, Operculina complanata (Defrance, 1822), Nephrolepidina praemarginata (Douvillé, 1908), Eulepidina sp., Planorbulina sp., Amphistegina sp., and Asterigerina sp. This foraminiferal association represents the Shallow Benthic Foraminifera Zone 22 (SBZ 22) of Rupelian-early Chattian age. Sedimentological analysis in the Burdur-1 and Burdur-2 sections has revealed an association of massive-unorganized conglomerate, parallel-bedded sandstone, massive mudstone, graded-massive conglomerate, graded-massive sandstone, well-sorted organized conglomerate, well-sorted parallel-bedded sandstone and microfossil-bearing parallel-bedded limestone facies. Alluvial fan / river, fan-delta, beach and shallow shelf carbonate facies communities were identified by lateral and vertical correlation of facies. It is concluded that the large Burdur Fan developed in a graben basin that opened and was flooded by a branch of the Tethyan Ocean that invaded southwest Anatolia during the Oligocene.
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