Abstract
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.
Keywords: Geoarchaeology, Geomorphology, Archeological Site, Kafiristan Yasen.

Introduction
Geoarchaeology is a rather new interdisciplinary approach that studies the past of human history using geological methods. In geoarchaeology, a complete and accurate understanding of ancient records can be obtained by identifying and examining the sedimentary content and stratigraphy of archeological layers and materials. Geology has been available to archaeologists over the past two decades as a basic tool for reconstructing ancient environments and understanding the long-term climatic and anthropogenic conditions and interactions of pre-historic human with the surrounding environments. These studies are particularly influential in understanding the Pleistocene and Holocene archaeological and geological backgrounds and materials. Geoarchaeological studies in Iran are mainly confined to Paleolithic sites and the use of geological methods such as sedimentology to describe the details of ancient records in caves and rock shelters. Geoarchaeology is an interdisciplinary discipline between geological sciences and archeology that examines the role of geological factors in the rise, continuation, and fall of ancient settlements. In this field, techniques and methods common in earth sciences such as aerial photography and satellite imagery, sampling, microscopic studies, chemical analysis, etc. are used to solve archaeological problems.On the other hand, inarchaeological geology, archaeological data are used to solve geological problems, particularly in relation to dating of Quaternary deposits, ancient seismological studies, and ancient mining. Large-scale archaeologists study most of the natural landforms and anthropogenic structures and small-scale archaeologists study the soil, natural sediments, and anthropogenic deposits. Archaeo-geology also occasionally covers other interdisciplinary studies such as ceramic petrography, archaeomineralogy, archaeometallurgy, radiometric dating, etc.

Identified Traces
This study presents the results of preliminary geological studies in the area of Kafiristan Yasen archaeological site to provide a general understanding of local geology and geomorphology of the area. The Yasen Kafiristan archaeological site comprises a set of settlement and cemetery sites located 35 km southeast of Deylaman. According to previous studies, thechronology of sites in the area varies from the Iron Age to the early Islamic period. Therefore, the present study seeks to map the environmental conditions of the Kafiristan Yasen archaeological sites in terms of geology, geomorphology and climate and to understand the relationship between environmental elements with the cultural and archaeological features of the cultural sites in the study area.Research method of this study is descriptive-analytical and field study which uses the spatial data related to the research problem to evaluate and investigate the relationship between environmental and cultural characteristics in the ancient sites of Kafiristan Yasen in southeastern Deylaman in Guilan province and to answer the research questions.Gathering information in the field surveys done with the using of observation, survey of landforms and geomorphological and geological processes in an ancient site, justification of features displayed on geological, topographic and climatic maps of the site, as well as utilization of software such as GPS and GIS.

Conclusion
The ancient site of the Kafiristan Yasen comprises a series of settlement and cemetery sites located 35 kilometers southeast of Deylaman. The approximate dating of antiquities in this area, according to previous studies, varies from the Iron Age to the early Islamic period. Yasen ancient site enclosures are mainly built on hillslope erosion terraces; the difference between the erosion of the soft layers and the hard layers is probably the main controlling factor for the formation of these hillslope 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 level. Unlike other ancient sites in the Yasen area, Zargolesi site is built on a single natural promontory consisting of silty and sandy rocks overlooking the Oshkoul-Dareh River. The study of surface sedimentary deposits in natural profiles and the wall of drill trenches shows that two sedimentary sections consist of very coarse gravelly sedimentary rocks and fine gravelly sediments in the clay-rich can be separated in most of the areas. Archaeological artifacts can sometimes be found alongside 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 may have deposited in a different hillslope profile to the present situation. The fine-grained alluvial sediments are mainly confined to the surface layers and probably represent historical sediments which deposited in a hillslope profile similar to the present situation. In some places these sediments have been cut by a later watercourse system.

Abstract
This paper presents a summary of a recently conducted geoarchaeological survey in the Susiana plains in southwest Iran. Here, the question of subsequent interaction of human settlements and their riverine landscape of the Greater Susiana region (roughly equivalent to modern Khuzestan) in the Later Village and the Early-historical periods (~ fifth to second millennium BCE) has been chosen as a case study. This study challenges the idea of the cultural expansion from South-Mesopotamia and its direct socio-political involvement in the spatial evolution patterns in Susiana in this timespan. It also offers an alternative interpretation: the riverine landscape and its spatial interaction with the settlement system. It has been suggested that the Later village settlements of Susiana were greatly influenced by the physical changes of the riverine landscape in their spatial development. This paper examines this hypothesis via geoarchaeological methods from the macro-level such as remote sensing to micro-level such as laboratory analysis of sediment logs to address this issue. The results of this study confirm three main points: (i) the westward migration of active watercourses in the mentioned time span; (ii) the direct correlation of this event with the spatial evolution of the studied settlements; and (iii) the overall differences between the neighboring plains of Susiana and south Mesopotamia in their geomorphological response to their fluvial evolution. 
Keywords: Geoarchaeology, Greater Susiana, Riverine Landscape, Later Village Period, Early History, Settlement Patterns.

Introduction
Geoarchaeology has established itself as a decisive means to study the human-environment-interaction in recent years. The use of geo-sciences in archaeology has revived the archaeological discourse regarding entanglement and niche construction theory, especially in the Near Eastern Archaeology. Yet, the Iranian archaeology lags behind in this matter. This paper contributes to this issue and aims to demonstrate the huge potential of geoarchaeological investigations in the Iranian archaeology.
The Susiana plains are an archaeologically rich region and suitable to examine the human-environment interaction in pre- and early history. The author has carried out a geoarchaeological survey in 2014 in this region to address this issue. The analyzed results have been published in detail (Rashidian 2020) and are briefly presented here.
Archaeological evidence of this region indicates a spatial change in the settlement patterns in the mentioned periods, including the abandonment of central settlements in the eastern plains and foundation of new settlements in the western plains (Adams 1962; Johnson 1973; Moghaddam 2012a). The common interpretation of this phenomenon related this spatial change to a socio-cultural or even political force from the South-Mesopotamian center, especially during the end of Ubaid and the beginning of the Uruk periods (Algaze 2005; 2008). This hypothesis has been discussed within the framework of the world-systems and criticized for decades, especially due to recent archaeological projects from modern Syria and neighboring regions. By integrating geoarchaeological investigations, these studies have shown that the spatial evolution of the settlements in the so-called periphery regions has been endogenic and not imported from Mesopotamia (McMahon & Crawford 2010; Ur et al. 2007). They have also offered alternative hypotheses for this phenomenon. Yet, for the Susiana region, this has remained the common hypothesis, despite occasional critic and speculation (Alizadeh et al. 2004; Moghaddam 2012a).
This has been the main focus of the present study, which examines two aspects: (i) There are strong indications of a westwards-migration of palaeo-rivers in the Mid-Holocene period, as mentioned by others (Kouchoukos 1999; Lees & Falcon 1952). (ii) In addition to a shift in watercourses and riverbed, such a fluvial change would affect the entire landscape immensely, for example, by changes in the surface slope, sediment freight, and soil characteristics. This probable landscape shift shall be comprehended in focusing on ten archaeologically known settlements (Abu Fanduweh, Abu Chizan, Band-e Qir, Chogha Mish, Dar Khazineh, Dehno, Haft Tappeh, Samirat, Sanjar, Sharafabad) in respect to the watercourses Dez, Karkheh, Karun, and their tributaries. During the here presented  geoarchaeological survey, hundreds of soil profiles, as well as fifty-one subsurface cores, have been documented in the environ of these settlements in the riverine landscape. 

Discussion
The sedimentological laboratory analysis of the documented horizons (surface and sub-surface) confirmed the large-scale migration of the rivers towards the west of the plain, which correlates with the spatial shift in the studied settlements, both in macro- and micro-level (in the region and within the settlements themselves). 
Furthermore, it was shown that not the large rivers, but the smaller rivulets had been the source of water for these settlements, despite prior speculation. Following the westwards fluvial migration, these rivulets have been cut off the hydrologic regime of the region and largely covered by recent sediments in the third and second millennium BCE. A number of them have been revived and integrated into the new canal network in the Early historical and Late Antiquity. Relative and absolute dating, based on material culture in situ and optically stimulated luminescence of sand in bulk samples respectively, have provided a dating framework for the presented geodata.
In general terms, focusing on geomorphological elements of the landscape such as slope, soil characteristics, and sedimentary regime has proved beneficial to examine the spatial evolution of prehistoric settlements. Susiana as a dynamic landscape has changed considerably in response to the fluvial regime change and extensive human impact. This has been attested in the presented geodata in this period. An intensification of the mentioned event is also confirmed for the later period, where the human impact has largely escalated due to centralized and planned developments of well established political entities From the Neo-Elamite to the Sasanian period. 

Conclusion
This study provided a range of results concerning the hypothesis and the relevant settlements. Three main points are summarized here: 
(i) The westward migration of Susiana’s active watercourses during the fifth to second millennium BCE has been confirmed using a combination of remote sensing, sedimentary analysis of cores, laboratory analysis of sediment horizons, and methods of indirect and absolute dating.  
(ii) A correlation in spatial evolution of settlement patterns with this fluvial development has been confirmed, based on available archaeological record of the ten mentioned settlements. This spatial correlation is attested both in macro- and micro-level. In this regard, a general tendency of settlements towards the western parts of the plain can be confirmed for this timespan. Furthermore, this has been attested in the spatial evolution within the settlements and it seems that some were following their migrating watercourses, and others have been abandoned entirely.
(iii) The results of this analysis also show the stark difference between the flat landscape of South-Mesopotamia with its large riverbeds as primary geo-elements in the west, and the softly sloped landscape of Susiana with its numerous rivulets and narrow floodplains surrounded by ridges and anticlines in the east. It is safe to assume that these starkly different landscapes have brought about equally different settlement patterns. Therefore, the settlement evolution of Susiana must be considered endogenic and studied in the framework of its landscape.
A detailed account of the presented study has been recently published (Rashidian 2020). A few case studies are also subject of English papers (Rashidian 2017; 2018; in press). The author hopes that this summary in Persian can contribute to the present discourse and encourage active members of the Iranian Archaeology to integrate geoarchaeological investigations into their projects. This is the only way towards further establishing an internationally acclaimed place for the Iranian archaeology.