Author: Ahmet TURAN
Publishing Date: 2010
Volume: 25 Issue: 4
There are Middle Carboniferous‐Early Cretaceous sequences of the Aladag tectonic unit, exposed as tectonic slices of the Central Taurides around the Beyreli area. The sequences correspond to the uppermost allochtonous unit, and known as Gevne nappe. In the area, the stratigraphic sequence of the Aladağ Unit begins by Carboniferous Yarıcak formation, which contains, at the bottom, limestone lenses including plentiful with fossils of fusulinid, coral , crinoid and brachiopod (Yarıcak formation) and continues with alternations 38 A. TURAN of limestone and quartzite with plentiful micro‐macro fossil. The Arpalık formation is represented by oncholitic limestones formed by Girvenella algal at the bottom, and limestone containing abundant crinoid and fusulinid with psammitic carbonate intercalations at the top. The Arpalık formation underlied the Yarıcak formation conformably, overlied by Late Permian Kuşakdağı formation disconformably. At the bottom, the Kusakdağı formation starts with quartzite, and continues with limestones including abundant algal, rare foraminifera and macrofossil with shale‐quartzite intercalations. Early Triassic G–kÇepinar formation is made up of oolitic‐stratmatolithic limestone, and conformably overlied the Late Permian sequences. At the top, G–kÇepinar formation shows transition to Early‐Middle Triassic the G–ztaşı formation with shales, marls and bivalve fossilliferous argillaceous limestone. Middle Triassic Beyreli formation, covered the G–ztaşı formation as conformable, is represented by flysch sequences with sand‐clay‐silt‐carbonate. The flysch deposits were covered with an angular unconformity by molassic deposits with terrestrial, semi‐ terrestrial character during Liass‐ Malm, which were possibly resulted from folding and uplifting processes by the Early Cimmerian tectonic phase. Lias‐Dogger terrestrial ÇamiÇi formation is made of red color, cross‐bedded conglomerate‐sandstone‐mudstone with lignite interbands, which is covered by Dogger‐Malm Dedebeleni formation including mudstone, shale, argillaceous limestone and thin lignite and gypsum intercalations, with semi‐terrestrial character. Stratigraphic sequence of Aladag unit in the region ends with Malm‐Early Cretaceous Cihandede limestone, which is made up by dolomite, limestone with dolomite and limestone formed in a shallow carbonate shelf environment.
Key Words: Aladağ Unit; Hadim Nappe; from Carboniferous to Cretaceous sequences.