First records of trace fossils from the Lake District, southwestern Turkey


NIELSEN J. K. , GÖRMÜŞ M. , UYSAL K. , Kanbur S.

BULLETIN OF GEOSCIENCES, cilt.85, sa.4, ss.691-708, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 85 Konu: 4
  • Basım Tarihi: 2010
  • Doi Numarası: 10.3140/bull.geosci.1189
  • Dergi Adı: BULLETIN OF GEOSCIENCES
  • Sayfa Sayıları: ss.691-708

Özet

Important new ichnological data was obtained from the Isparta Cay Formation (Triassic to early Cretaceous), Koctepe Formation (middle Paleocene to Early Eocene), Isparta Formation (Early to Middle Eocene) and Incesu Formation (Middle Eocene to Early Oligocene). These formations are significantly exposed in the Egirdir, Gonen and Isparta regions within the northern part of the Isparta Angle. An overview of the stratigraphy and its trace-fossil bearing formations and microfossil content is presented together with recommendations. The density and diversity of trace fossils vary between and within these formations, which originated in deep-marine shelf slope and shelf environments of the Neotethys ocean. Changes in the frequency of abrupt turbiditic deposition, oxygenation of the bottom water and possibly food availability are reflective in the trace fossil distribution. The trace fossils of the Isparta Cay, Koctepe and Isparta formations are typical of deep-marine settings with occasional high-energy turbiditic conditions. The Isparta Cay Formation (Paleodictyon ichnosubfacies) is seen as the bedrocks of the region, whereas the Isparta Formation (Ophiomorpha rudis ichnosubfacies) overlies conformably the Koctepe Formation (Nereites and Arenicolites ichnofacies). The Incesu Formation is laterally interlaced with the Isparta Formation. A high diversity of trace fossils occurs in the Incesu Formation (Zoophycos ichnofacies), which was formed in an outer shelf environment. Findings from previous ichnological investigations in Turkey are compiled and compared with the present results from the Isparta Angle.