The Geoarchaeological Studies of the Archaeological Area of Kafiristan Yasen, Southeast of Deylaman, Guilan

In geoarchaeology, a complete and accurate understanding of archaeological site-formation processes can be obtained by identifying and examining the sedimentary deposits and stratigraphy of archeological layers. This study presents the results of preliminary geological studies in Kafiristan Yasen archaeological area to provide a general understanding of local geology and geomorphology of the area. Kafiristan Yasen archaeological sites are mainly built on hillslope erosional terraces. In settlement sites, such as Gerdekulisi, it seems that ancient architectural structures acted as sediment traps for deposition of debris sediments and recent hillslope alluvial sediments (Holocene) on the hillslope terraces. Unlike other ancient sites in the Yasen area, Zargolesi site is built on a single natural ridge consisting of siltstone and sandstone rocks overlooking the Oshkoul-Dareh River. The study of surface sedimentary deposits in natural soilas well asexcavation trenches shows that two sedimentary units consisting of very coarse gravelly sediments and fine gravelly sediments in a clay-rich matrix could be distinguished in most of the areas. Archaeological artifacts can sometimes be found in the context of coarse gravelly sediments and in some places are covered by fine-grained alluvial sediments. The gravelly sediments appear to be related to an older sedimentary phase that might have deposited in a different surface morphology to the present situation. The fine-grained alluvial sediments are mainly confined to the surface layers and probably represent historical sediments which have been deposited in a hillslope profile similar to the present situation. In some places these sediments have been cut by a later drainage system.