Orthophragminid foraminiferal assemblages from an Ilerdian-early Cuisian reference section (Sakarya section, Haymana-Polatli Basin, central Anatolia-Turkey)

Colakoglu S., Ozcan E.

RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA, cilt.109, sa.1, ss.45-61, 2003 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 109 Sayı: 1
  • Basım Tarihi: 2003
  • Dergi Adı: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.45-61
  • Anahtar Kelimeler: biostratigraphy, Orthophragminid foraminifera, Discocyclina, Orbitoclypeus, Nemkovella, Asterocyclina, biometry, middle-late Ilerdian/early Cuisian, central Anatolia, Turkey, ORBITOCLYPEUS, PALEOCENE
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

The Sakarya section represents a highly fossiliferous part of the Haymana-Polath Basin succession (central Anatolia), consisting of mainly nummulitid, alveolinid and orthophragminid foraminifera. This section formerly proposed to serve as a reference section for early Ilerdian-early Cuisian Shallow Benthic Zones in Turkey by the 'Early Paleogene working group' was studied for its orthophragminid foraminifera, and a sequence of populations has been subjected to biometric analysis of the embryo and equatorial chamberlets. Discocyclina, which occurs throughout the section, is mainly represented by primitive specimens of Discocyclina archiaci, D. archiaci bakhchisaraiensis and Discocyclina sp.1 in the lowermost part, which is regarded as of middle Ilerdian age (orthophragminid zone 3). Upwards, different developmental stages of D. archiaci; transitional developmental stages of D. archiaci bakhchisaraiensis-staroseliensis and D. archiaci staroseliensis are accompanied sporadically by unribbed Orbitoclypeus, O. schopeni suvlukayensis and Discocyclina sp.1. This part of the section is regarded as middle-late Verdian in age (orthophragminid zone 4). A more diverse assemblage, represented by Nemkovella, Asterocyclina, ribbed and unribbed Orbitoclypeus accompanied by different Discocyclina species occurs in the uppermost part, which is thought to represent the transitional late Ilerdian-early Cuislan orthophragminid zones (orthophragminid zones 4/5). In these horizons, N. strophiolata fermonti, N. evae, primitive developmental stages of D. augustae sourbetensis, O. douvillei douvillei, D. fortisi fortisi, A. stella and O. munieri munieri are accompanied by D. archiaci staroseliensis, transitional developmental stages of D. arcbiaci staroseliensis-archiaci, O. scbopeni suvlukayensis and Discocyclina sp. 2. Biometric data allow refinements with respect to the stratigraphic ranges of some discocyclinid and orbitoclypeid foraminifera. This paper records the first descriptions of orthophragminids from the middle-late Ilerdian/early Cuislan marine deposits of Turkey.