OSTRACOD AND FORAMINIFER ASSEMBLAGES OF TERTIARY SEDIMENTS AT W. BAKIRKÖY (ISTANBUL)

Year 1999, Volume: 121 Issue: 121, 1 - 1, 01.02.1999

Ümit Şafak Niyazi Avşar Engin Meriç

Abstract

The drilling samples taken from
the western part of the Bakırköy Basin were investigated, and the
microplaeontological data were evaluated. Pliocene, Late Miocene and Late
Eocene aged sediments have been observed from top to bottom of drilling, at the
results of the laboratory investigation. 14 genera and 25 species from the
ostracods and 10 genera and 8 species of benthic foraminifera from the Pliocene
sediments: 6 genera and 11 species of ostracods, 9 genera 9 species of benthic
foraminifera from the Late Miocene deposits and 11 genera and 11 sepices of
ostracods and 20 genera and 6 species of benthic foraminifera from the Late
Eocene sediments were described. The microfauna of Pliocene sediments consists
of Cyprideis seminulum (Reuss), C. pannonica (Mehes), C.anatolica Bassiouni, C.
torosa (Jones). C. tuberculata(Mehes). C. trituberculata Kristic. C. pontica
Kristic are rare, and characteristic for Pontic Basin. In addition, Loxoconcha
sp., Semicytherura sp.. Xestoleberis margaritae Mauller, X. ventricosa Mueller.
X, reymenti Ruggieri, X. communis Mueller. Darwinula stevensoni
(Brady&Robertson), D. cylindrica Straub. llyocypris cf., bradyi (Norman),
Candona (Candona) altoides Petrovski. C. (Candona) parallela pannonica Zalanyi.
C. (Candona) decimal Freels, C. (Candona) Candida (Müller). C. (Candona)
neglecta Sars Heterocypris salina salina (Brady), Eucypris dulcifons Diebel &
Pietrzenuik are found in the sequence, and foraminifera consisting of
Siphonaperta aspera (d'Orbigny), Quinqueloculina seminula (Linne), Eponides
concameratus (Williamson), Clbicidodies sp., Cibicides advenum (d'Orbigny),
Asterigerina sp.. Ammonia compacta Hofker, A. parkinsoniana (d'Orbigny).
Challengerella bradyi, Billman, Hottinger & Oesterle, Elphidium crispum
(Linne) are of Pliocene age. The following species were identified from the
Upper Miocene; these are respectively Cyprideis seminulum (Reuss), C. pannonica
(Mehes), C. anatolica Bassiouni. C. torosa (Jones) C.pontica Krstic,
Tyrrhenocythere triebeli Krstic, Xestoleberis ventricosa Mueller, X. reymenti
Ruggieri. llyocypris cf. gibba (Ramdohr). Heterocypris salina salina (Brady)
from the ostracods species and Quinqueloculina seminula (Linne). Q. cf.
lamarckiana d'Orbigny, Quinqueloculina sp. 1, Quinqueloculina sp. 2,
Cibicidoides sp, Eponides concameratus (Williamson). Lobatula (Walker &
Jacobs), Ammonia compacta Hofker. A. parkinsoniana (d'Orbigny), Porosononion
subgranosum (Egger). Elphidium crispum (Linne) from benthic foraminifera. Upper
Eocene sediments contain following ostracods; Cytherella triestina Kollmann.
Bairdia subdeltoidea (Muenster), B. elongata Lienenklaus, B. cymbula Deltel, B.
crebra Deltel, Bairdoppilata cf. gliberti Keij, Triebelina punctata Deltel,
Schizocythere appendiculata appendiculata Triebel, S. tessellata tessellata
(Bosquet). Eucythere sp. 1, Eucythere sp. 2, Thracella apostolescui Sönmez,
Krithe rutoti Keij, Echinocythereis isabenana Oertli. Leguminocythereis
genappensis Keij, Nucleolina multicostata (Deltel), Pokornyella osnabrugensis
(Lienenklaus). P. ventricosa (Bosquet), Hermanites paijenborchiana Keij, H.
triebeli Stchepinsky, Quadracythere vermiculata (Bosquet). Q. hulusü
SönmezG6k9en. Cytheretta tenuistriata (Reuss), C. bartonica Sönmez-Gökçen.
Xestoleberis sublobosa (Bosquet). X. muelleriana Lienenklaus, Uroleberis sp.,
Paracypris contracta (Jones) Among the foraminifera Halkyardia minima (Liebus),
Sphaerogypsina globula (Reuss). Asterigerina rotula (Kaufmann), Chapmanina
gassinensis (Silvestri), Nummulites fabianii (Prever), N. striatus (Bruguiere)
are characteristic for this level. According to result of the drilling samples
taken from the western part of the Bakırköy and Ataköy region, it is indicated
that there were the restricted environments, and that salinity reduces
depending on the shallowness in Late Miocene and shallow marine in Late Eocene
in the region. In addition, it is observed that it changed to lagoonal and
shallow marine in the Pliocene.

Keywords

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