Scholarly record
SEDIMENTOLOGY OF BEYKOYU FORMATION (MIOCENE) AROUND BEYKOYU – KUSKUNCUK – GOKCEYAZI (EREGLI – KONYA - TURKEY)
Abstract
The basement of the investigated area consists of Upper Permian – Upper cretaceous aged the Bolkardagi Group and several formations situated in the Bolkardagi Unit, tectonostratigraphic units of the Taurus, viz., Paleocene – Lower Eocene aged the G\"uneydağı formation, and Upper Paleocene – Eocene aged the Halkapınar formation. The limestone of the Guneydagı formation is observed as a basement rock in the area, and is overlied with angular unconformity by Miocene aged the Beykoyu formation, which is made up of members of the Kabaktepe gypsum and the Kayalidagtepe stromatolitic limestone. The Beykoyu formation is overlied with an angular unconformity by Upper Pliocene – Holocene aged the Kuskuncuk formation, which consists of alternation of conglomerate, sandstone and mudstone including caliche bands in some levels. While the Beyk\"oy\"u formation was formed in lacustrine environment, the Kuskuncuk formation was developed in environments of alluvial fan and braided stream. The Kabaktepe gypsum member, basement of the Beykoyu formation, is white – gray in colour and is usually massive, rondomly medium to thick strata and have a laminae. The gypsum of the Kabaktepe gypsum member is usually white in colour and cyrstalized texture, at some levels they are prismatic and transparent, and folded in places. At some places, at the bottom of the gypsum, alternating of conglomerate - sandstone and mudstone can be observed. Through the upper part, the alternating of greenish – gray, brown sandstones and green – red coloured mudstones are present. In the upper levels they are in the form of gypsum with muddy stone interlayer. Over the gypsum, stromatolitic limestones belonging to the Kayalidagtepe member are found. The stromatolites are beige, brown in colour, medium to thick layered, and these are in the types of lateral linked hemispheroidal (LLH type), stacked hemispheroidal (SH type) and onkoides (SS type). The stromatolitic limestones have interlayering gray mudstones, red conglomerate, sandstones and mudstones. In some levels the stromatolites can be seen as sandy – gravel limestones which have ostrocode and gastropoda fossiliferous limestones alternating with marls. The formation of stromatolitic limestones belonging to the Kayalıdağtepe member is strictly depending on the blue – green algae of Shizothrix sp., Phormidium sp. and Scytonema sp.
Publication details
References24
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