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    STUDIA GEOLOGIA - Issue no. Special%20Issue / 2009  
         
  Article:   GEOLOGY OF THE AGATE AND OPAL – BEARING FORMATIONS IN THE DEREYALAK VILLAGE (ESKISEHIR), TURKEY.

Authors:  . 		 
       
         
  Abstract:  This study presents the geology and mineralogy of the agate and opal nodules which occur in the Pliocene polymictic conglomerates of the Höyüklü Formation, NW of the Dereyalak village (Eskisehir, NW Turkey). The host-rock of agates and opals cropps out on over 1.5 km, as a layer of 5-25 m thickness. It consists of well-rounded pebbles, mainly ultramafics, sandstones, limestones and volcanics. The conglomerates unconformable overlay the Cretaceous ophiolitic complex. The tectonic contact, with an E-W direction, is accompanied by another NE – SW trending major fault. Most of agate nodules occur along these fault zones.

Key words: agate, opal, sepiolite, conglomerate, Pliocene, Eskişehir, Turkey
  
         
     
         
         
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