Abstract: The analcime bearing pyroclastic rocks »situated at 45 km SW of Karaman (Konya) are interbedded within the rocks of Cretaceous age which have a thickness of approximately 600 m. These pyroelastites, formed by volcanicactivity, show a normal graded bedding. Their classification is based not on the size of the fragments, but the compositional properties of them.By XRF analysis, it has been found that these rocks contain Na2O in quantities higher than normal, and were probably rich in terms of volcanic glass. It is possible that this oxyde has entered in the composition of the pyroclastitesby chemical action of the sea water - probably metasomatic processes. In the first of two stages of transformations thattook place later, the analcime, which is the mos characteristic mineral of the pyroclastites, was most likely formed bydiagenesis of volcanic glass. Subsequently, a low grade metamorphism corresponding to the upper most part of zeolitefaeies occurred. In fact, the analcime is partially - totally transformed in a secondary albite in which relicts of theformer mineral can often be observed.