Engin Ünay

Episodic Graben Formation and Extensional Neotectonic Regime in West Central Anatolia and the Isparta Angle: A Case Study in the Akşehir-Afyon Graben, Turkey

Abstract Central and Western Anatolia form a continental back-arc region related to the Hellenic-Cyprus convergent plate boundary of the Anatolian and African Plates. The Akşehir-Afyon Graben (AAG), the easternmost extension of the west Anatolian horstgraben system, is located at the junction of Central Anatolia and eastern limb of the Isparta Angle. The AAG is 4–20 km wide and 90 km long. It trends west-northwest-east-southeast and is an actively growing rift containing two sedimentary infills of continental fluviolacustrine origin bounded on both sides by oblique-slip normal faults. The older infill is folded, thrust faulted and early Late Miocene in age. The younger infill, which is nearly horizontally bedded, is Plio-Quaternary in age and rests on the older infill with angular unconformity. The deformation of the older infill and the angular unconformity indicate a Late Miocene phase of compression, which separates two extensional periods. The second phase of extension has lasted since the Pliocene and is part of the current extensional neotectonic regime of both west Central Anatolia and the Isparta Angle, despite being previously reported as a compressional neotectonic regime. The graben-bounding Akşehir Fault Zone (AFZ) and the Karagöztepe Fault Zone display well-preserved fault surfaces and slickenlines. Although stereographic plots of the fault slip data show that the graben-bounding structures are oblique-slip normal faults, the AFZ has also been described as a single reverse fault. Both the field and seismic data, particularly the 1921 Argıthanı-Akşehir and 1946 Ilgın-Argıthanı earthquakes, indicate that the AAG is an active neotectonic structure. However, it can also be interpreted to lie in a seismic gap when its rate of seismicity is compared with that of the Gediz-Simav Graben forming its west-northwestern extension.

New Neogene Rodent Assemblages from Anatolia (Turkey)

Mapping projects in continental Tertiary basins under the auspices of the M.T.A. (Mineral Exploration and Research Institute of Turkey) led in recent years to the discovery of many sites yielding small mammals from formations that were previously considered to be unfossiliferous. This study gives a brief account of the lithostratigraphy and biostratigraphy of the continental deposits of the southern part of the Kayseri-Sivas basin. The rodent assemblages collected in that area are ranging in age from the Middle Oligocene to the early Pliocene, showing a gap in the early Miocene. We have filled this hiatus in our knowledge by studying two assemblages from successive levels in the lignite quarry of Harami (Aksehir area).

A new association of small mammals from the lowermost Lower Miocene of Central Anatolia

Abstract The association of smaller mammals from the locality Inkonak M.R. 6 in the upper part of the Dokmeta§ memberof the Cevizcik Formation is described. Seven genera and species of rodents and three genera and species of insectivores are recognized. Two new genera and species of muroids: Meteamys alpani and Muhsinia steffensi are defined. Comparison of the Early Miocene association from Inkonak M.R. 6 with the older association from Yenikoy and the younger ones from Kilcak suggests a rapid change in the rodent fauna of Anatolia during the Late Oligocene and Early Miocene.

Una asociación de roedores del tránsito Eoceno/Oligoceno próxima a Süngülü, Lesser Caucasus, Turkey

The assemblage of rodents from Sungulu that will be described below contains two genera and species of Ctenodactylidae, one genus and species of Dipodidae and seven genera representing eight species of Muridae. Three genera and seven species are new. The composition of the assemblage shows that this rodent fauna from Anatolia differs in many respects from that of Europe and Central Asia and is therefore endemic. The age as inferred from the fauna is Latest Eocene or Earliest Oligocene.