Abstract
This paper will focus on Lithic assemblages from three sites in the eastern part of Kurdistan province. The Chalcolithic period appears with different pottery tradi-tions than the earlier period in the Zagros, these changes appear mainly in the emergence of a variety of long blades and very regular and standard sickle blades. Due to the importance and lack of studies on the Chalcolithic Lithic, the main ques-tion in this article is what was the technology and function of the tools in the Chal-colithic period? The results show the technology of direct percussion with a hard hammer used to in the primary stages of Chalcolithic, and in the late phase, in addi-tion to the earlier method, the pressure technique has also been used to construction of long blades and sickle blade. Also, long blades and sickle blades, in terms of production technique, are continued in the Neolithic period in the Zagros, but in terms of dimensions as well as the ratio of blade length to width in a new class which is a new indicator for the Chalcolithic period. The results show that the con-struction of regular sickle blades begins in the late Chalcolithic phase. The skill of making tools is undoubtedly related to exist people who have special ability for these products, and they have distributed these tools in certain areas; because the least waste of high-quality flint of these blades has not been found in the sites. While most of the debris belong to raw material that are easily accessible in the riv-erbed.
Keywords: East of Kurdistan, Chalcolithic Period, Lithic Artifact.

Introduction
The stone artifacts in this study are the result of excavations in Tepe Gheshlagh (Motarjem & Sharifi, 2015; Sharifi & Motarjem, 2018), Tepe Kalanan (Saedmoucheshi, 1390), and Golali (Saedmoucheshi, 1398) in Kurdistan province (Figure 1). In this region, the chronology of Tepe Gheshlagh, one of the key site in the Chalcolithic period that shows the sequence of this period (Motarjem & Sharifi, 2014). On the other hand, all samples of artifacts obtained in intact layer and with absolute chronology (Table 1). The Chalcolithic period in the Central Zagros has been studied by many scholars (see Young & Levine, 1974; Abdi, 2002 & 2003; Henrickson, 1983 & 1985), and most studies have focused on pottery and other data. Various sites in this area such as Godin (Young, 1969), Sehgabi (Young & Levine, 1974) have been explored before the Islamic Revolution of Iran and there isn’t an independent report on the tech-nical classification of stone tools. Study of Lithic artifacts in the Cen-tral Zagros including superficial study of Tepe Ban-Asyab (Bernbek et al., 2011), superficial study of Hersin (Mortensen & Smith, 1977), Chogha-golan and Towe Khushkeh sites in Islamabad plain (Abdi, 2002). Also, the study of lithic tools tradition in the sixth and fifth millennium BC in the Zagros gets limited to (Kozlowski, 1999; Nishiaki, 2013, 2019) and west of Kurdistan (Hariryan et al., 2021). In this regard, the study of stylistic differences in terms of technology, typology, and access to sources of raw material, as well as trade of some stones such as obsidian is momentous. Therefore, research questions include the following: (1) what is the basis of the tool-making tradition in East Kurdistan? And (2) Due to socio-economic complexities that occurred during the Chalcolithic period, what changes have taken place in the Lithic artifacts? The hy-pothesis of this research is that the Post-Mlefaatian tradition of tool making has been prevalent in this region. In fact, the purpose of introducing and analyzing of Chalcolithic Lithic is paying attention to them as cultural data that an important role in cultural communication and interactions.

Conclusion
The study of stone artifacts during the Chalcolithic period and beyond has never been seriously considered in Iranian archeology, this is due to the prevalence of evolutionary archeology. This approach goes back to the Serialization and connec-tion of cultural transformation circles to each other, without an explanatory and an-alytical approach to the lifestyle and cultural exchanges and human dynamism in the habitat. Discussions that were considered only after the spread of new archeol-ogy. The study of stone artifacts in this study shows that the insignificant quantity of tools in the early and middle phases of Chalcolithic, It shows the focus of the residents of this area on livestock. Because the Habitat around Tepe Gheshlagh and Kalanan are mainly steppe and less fertile. In the late phase, the production of Lith-ic tools increases, especially the examples related to grain harvesting, which indi-cates a kind of more attention to crop production. This leads to decline of livestock or the increase of population in the region and even familiarity with new cultivation methods. In the late Chalcolithic, this region has Cultural Horizon with the late Obeid, early Uruk and the Sabz period of Dehloran and Khuzestan. At this time, agriculture based on irrigation has been proposed on southern region such as Susa and Dehloran. In these periods, all the tools used in agriculture, focused on Lithic tools and implements including plowing tools, sickles, mortars and hand tools. In fact, the construction of practical tools, the use of different raw materials, and the interpretation of regular and long sickle blades represent an advanced and evolving technology. The produce of regular sickle blades from high quality stone, disap-pearance of small scrapers (trapezoidal and triangular) and the limitation of serrated tools are the most important changes in this period compared to the Neolithic peri-od. 
Lithic assemblages during the 6th and 5th millennia BCE in the Zagros is known as Post-Mlefaatian tradition (Kozlowski, 1999). The use of pressure Debitage tech-nique to produce long blades and sickle elements is one of the most significant fea-tures of this tradition. In the Post-Mlefaatian, the length of the blades increases. In East Kurdistan, we are faced with two technologies for making stone tools, (1) The use of direct percussion for primarily stage of removing, and (2) The use of pres-sure technology for construction of sickle blades. We have a limited number of long blades in Gheshlagh and Gelali sites, but the construction of these blades, like other regions of the Zagros, shows the use of the Post-Mlefaatian tradition in this region.
It is probable that after 3 to 4 thousand years of domestication of devolving of wheat stem compared to other species such as Emmer and Einkorn of the Neolithic period, In order to harvest, thicker and stronger blades need to create. The produc-tion of thicker blades in this period has been a technical adaptive response to this need. Hence, the discussion over the assumption about the prevalence of irrigation in the Chalcolithic period, even to a limited extent, has led to change in Lithic tools production related to agriculture, especially sickle blades. On the other hand, issues such as the formation of full-time or part-time expert groups, access to high-quality flint mines for proper production, distribution and exchange are raised. As men-tioned in the discussion, there is no evidence of regular sickle blades construction on the site, in the eastern Kurdistan. On the other hand, presence of obsidian in Gheshlagh and Kalanan sites show continuation of the old distribution network of the nearest neighbor to the far regions in eastern Kurdistan. The presence of obsidi-an and lack of evidence for making sickle blades from dark flint, indicate the pos-sibility of making blades produced from this species in specialized workshops out-side the site and their import to these areas.

Abstract
The Qaleh Naneh site in Iran is the largest prehistoric site in the basin of Lake Zaribar that has been excavated. The site is located in the northwest of Iran, southeast of Lake Zaribar, and is connected with northern Mesopotamia through the Shiler Pass. The Chalcolithic period, especially the Ubaid and Uruk cultures, is the longest period of settlement in the site. This region was more connected with Mesopotamia in the prehistoric period. Stone tools are an essential component in understanding the socio-economic structures of prehistoric societies. However, the study of stone tools of the Chalcolithic period in Western Iran and the Zaribar Lake basin is limited. The study of stone tools in the Qaleh Naneh site provides valuable insights into the material culture and social organization of prehistoric societies. Structural changes in technological social networks from Ubaid to post-Ubaid may be observed in various aspects of stone tool production. The relationship between the methods used and the social changes of the inhabitants of Tepe Naneh has been explained as much as possible based on the stone artifacts. The stone artifacts obtained from the site were produced by a special group and spread throughout the region and the Zaribar Lake basin. The pottery evidence also shows extensive inter-regional connections. At least in the late Chalcolithic period, the production of stone artifacts in this region was on a workshop scale. Similar to the sites in the fifth and fourth millennium BC in northern Mesopotamia where stone artifacts were produced near the sources of raw materials and outside the settlements, the production model at Tepe Naneh is similar to northern Mesopotamia according to the type of stone artifacts. 
Keywords: Lake Zaribar Basin, Tape Naneh, Chalcolithic Period, Stone Tools

Introduction
The archaeological site is located at 16km. south-east of the modern city of Marivan, and is partially occupied along the southern and western slope by the modern village of the same name which has partially altered the original conformation of the settlement. The Qaleh Naneh site in Iran is one of the largest prehistoric sites in the basin of Lake Zaribar and is connected with northern Mesopotamia through the Shiler Pass. The site has been excavated extensively, but the study of stone tools from the Chalcolithic period in Western Iran and the Zaribar Lake basin is limited. The excavation of three 2m wide step-trenches along the eastern, northern, and western slopes of the site enabled the study of occupational deposits from the Chalcolithic to Islamic periods. The Ubaid phase 3-4, in the lower layers of Trenches A and B, also common are Uruk Ware in late chalcolithic period. The study of the cycle of production, consumption, repair, replacement, and discarding of stone tools is investigated under the title of analysis of stone industries in archeology (Jayez, 2016). The study of stone tools in the post-Paleolithic sites is usually less noticed by archaeologists, and the study of stone tools of the Chalcolithic period in the Zaribar Lake basin is rare. 
Stone tools are an essential component in understanding the socio-economic structures of prehistoric societies. This research aims to fill this gap and examine the obtained stone artifacts in terms of their construction, use, and relationship with social changes. The stone artifacts obtained from the site were divided based on morphology, manufacturing technology, mineral type, color spectrum, raw material used, and typology. The general characteristics of the artifacts were also considered according to the texture. The study found that the stone artifacts were likely produced by a special group and spread throughout the region and the Zaribar Lake basin. The most important questions in this field:
1- Where were the stone tools of Tepe Naneh produced? 2- Has there been a connection between the method used and the social changes of Tepe Naneh residents?
It seems that; the study also found that there was a connection between the method used in producing stone tools and the social changes of Tepe Naneh residents. The production model at Tepe Naneh is similar to northern Mesopotamia, where stone artifacts were produced near the sources of raw materials and outside the settlements.

Discussion 
The structure of prehistoric stone assemblages is different from the Paleolithic era, but they still reflect many economic complexities of societies. In the Chalcolithic period, one of the characteristics of the artifacts is the single-use nature of many of them, which were produced in a non-specialized way or for a wide range of domestic activities. The other group of artifacts are blades, micro blades, and groovers, which are semi-specialized and specialized. This process was created in the Neolithic period and continued until the Bronze and Iron Ages. Over the course of several thousand years, metal replaced stone technology (Rosen, 1997) .The study of raw material sources, their availability and abundance, and how they were used are important in understanding the economic systems of that era and the evolution of various aspects of human behavior. The study of raw stone dispersion is a suitable solution for solving the problems related to the living places of prehistoric humans and the surrounding areas, exchange and mutual social, economic, and cultural relations (Inizan, 1999).
After studying 271 pieces of stone tools from the Qaleh Naneh site, three different types of stone were identified, and the most commonly used raw material for tool production was different types of chert with different colors. The assemblages show that gray chert was used for 35.79% of the tools, and brown for 26.94%, far more than other colors. In total, chert tools include the largest number of tools at 91.88%. Additionally, 75.7% of all tools were obsidian tools, which is one of the imported and non-native stones of the region. The evidence shows that almost all obsidian tools obtained from sites in the west and northwest of Iran are from Armenian and Turkish obsidian sources, while pieces of obsidian tools from Naneh were brought from eastern Anatolian mines. Only one piece of sandstone was obtained, and in general, most of the tools were produced of silicate stones. The study of raw materials used for tool production provides valuable insights into the socio-economic structures of prehistoric societies in the Zaribar Lake basin and their connections with neighboring regions. The use of non-native stones, such as obsidian, indicates that the inhabitants of Qaleh Naneh had extensive inter-regional connections. The study also highlights the importance of considering the raw material sources and their availability in understanding the technological developments and socio-economic structures of prehistoric societies. 

Conclusion  
Tepe Naneh is a prehistoric site located in the Zaribar Lake basin, which was one of the largest settlements during the Chalcolithic period. The site has provided valuable insights into the production and distribution of stone tools in prehistoric societies. The pottery evidence shows extensive inter-regional connections, and at least during the Late Chalcolithic period, the production of stone artifacts in this region was on a workshop scale. At the end of the Ubaid period, the number and variety of stone tools decreased, which coincides with social and economic changes seen in many sites, including Tepe Naneh. At the same time, wide communication networks were formed. The trenches excavated on three sides of the site show a large structure in the late Chalcolithic- Uruk period, with visible changes in different aspects. The evidence of Naneh shows that this area in prehistoric period mostly related to Mesopotamia than western Iran. Lower layers martial dated to the beginning of the fifth millennium, which slightly overlapped with the Early Northern Ubaid. The Uruk phase of the Late Chalcolithic (end of the 4th millennium BC) has been identified in two trenches (A and C): typical Bevelled Rim Bowls attested in different size classes and mixtures.
The study of stone tools at Tepe Naneh raises two important questions: where were the stone tools produced? And is there a connection between the method used and the social changes of the site’s residents? The investigation of different stone hand tools at Tepe Naneh shows that part of the process of producing hand tools was done on-site, although extensive excavation is needed to identify the exact location. However, the limited number of core stone types and the percentage of stone tools suggest that most of the preparation and production steps were done outside the site. There is also no evidence for the production of obsidian tools at the site. The analyses indicate that the obsidian of the site comes from two sources, both located in Eastern Anatolia, which has reached this area through a wide network of obsidian. It was first imported to northern Mesopotamia and then to Marivan region. The evidence suggests that the production of stone tools was not limited to on-site activities and involved extensive inter-regional connections. Further excavation and research at Tepe Naneh may shed more light on the prehistoric societies that inhabited this region and their technological advancements and complex interactions and exchanges between different prehistoric communities.

Abstract
Excavations at Gird-iAshoan, An Archaeological mound in Piranshahr County in the Lower Zab Basin, provided remarkable insights into cultural traditions characterizing the region in the Late Chalcolithic. Whilst reflecting some indigenous peculiarities, its material culture exhibits broad affinities with Northwest Iran, Caucasia, and Anatolia. This evinces the spread of the Late Chalcolithic (LC) cultures, especially LC2‒3, over vast territories, which could imply either population movements or spread of a certain pastoralist subsistence system. of the total of four architectural phases presently known from the Chalcolithic deposits of Gird-i Ashoan, the two upper phases were recorded in the first season. Phase 1 consisted of dry-laid stone walls in the northern quadrant of the trench,while Phase 2 was represented by perpendicular mudbrick walls beginning from -3.43m and ending at -3.62m. The recovered mudbricks measured 40 × 60 cm. In this paper, an attempt is made to explain the cultural relations of the Zab basin with other regions by presenting a detailed stratigraphy, and an analysis of the recovered architectural remains. To conclude, observations made at Gird-i Ashoan suggest that in the fourth millennium, the Early Chalcolithic III‒II culture reached the Zab region, where it would eventually be replaced by the subsequent Hasanlu VII culture. In this article, we will introduce the Architecture remains and the methods. With its thick deposit of 8.65 m, Gird-i Ashoan in the Zab basin represents a key point in northwestern Iran.
Keywords: North-West Iran, Pisdeli, Late Chalcolithic Period, Mud-brick Architecture, Chaff-Tempered (CFW).

Introduction
The opening of the 5th millennium BC coincided with the arrival of the Dalma cultural tradition, which extended over vast territories (Hamlin 1975; Henrickson 1983; Henrickson and Vitali 1987). It was to be superseded in the mid-5th millennium or somehow later by the Pisdeli tradition (Dyson 1968; Dyson and Young, 1960: 20). The Pisdeli horizon, designated as Hasanlu Period VIII, was dated between 4300‒ 4500 BC (Voigt and Dyson 1992), which is also corroborated by radiocarbon dates (Danti et al., 2004). It was eventually replaced by the cultural tradition of the Late Chalcolithic in the region. An outstanding question about the period in northwest Iran concerns the little-known phases of Late Chalcolithic III‒II. The time-span is of particular import for the regional archaeology as it has a bearing on the phenomenon of social complexity and the beginning of the urbanization. Unfortunately, ambiguities remain about the chronology of the period due to the lack of regular excavations. Although recent discoveries have provided new information in this regard, the absence of serious excavations of the Chalcolithic deposits deprives us of the attributes of the coeval culture. Mellaart regards the Ubaid as a Late Chalcolithic culture (1966). Helwing splits it into three sub-periods, with the earliest being the Pisdeli (LCh I) (Helwing, 2012: 204) and the Chaff-Faced Ware (CFW) typifying the subsequent LCh III ‒II (Helwing, 2005). In Iran, related material is currently known from Gird-i Ashoan and Kul Tepe, while beyond the Iranian borders they occur at several sites, among them being Çadır Höyük, Kenan Tepe, Arslantepe, Barcın Höyük and Höyük in Anatolia and Leyla Tepe, Beyuk Kesik, Mentesh Tepe, and Alchan tepe in Caucasia (Baxşeliyev, 2010).
Following preliminary inspections, Gird-i Ashoan was selected for excavation in 2019 as the key Late Chalcolithic site. Among the main objectives of the present study were gaining an insight into the settlement sequence, examining the Hasanlu VIII cultural tradition of the Zab basin in light of recent archaeological finds, and investigating the cultural interactions of the local populations with the neighboring regions. Attempts were made to obtain a better understanding of the Late Chalcolithic cultural horizon. The excavation at Gird-i Ashoan yielded a assemblage of Pisdeli painted ware (LCh I), while the LCh III ‒II ceramics, the so-called Chaff-Face Ware native to northern Mesopotamia, were attested in abundance. In the period that immediately followed the Ubaid, North and South Mesopotamia each began to proceed along different directions culturally. Hence, the southern sphere witnessed the spread of the Uruk tradition, while the northern one would be overwhelmed by the Chaff-Faced Ware culture (Kepinski, 2011:65). This ware type occurs over vast territories, which also includes northwest Iran, where the related material culture and chronology share wide affinities with the sites of North Mesopotamia, Syria and East Anatolia, in particular by the latter half of the 4th millennium (Helwing, 2004:16). The location of Gird-i Ashoan close to northern Mesopotamia and eastern Anatolia significantly contributed to the materialization of the shared traditions. 
  East Anatolia, South Caucasia and Northwest Iran served as the milieus for the genesis and further development of the Chaff-Faced Ware tradition and later the Kura-Araxes culture. The regions have always been the crossroads of various peoples with diverse ethnic and cultural affiliations, and most of the migrant or invading groups would cross them in their east-west movements over the centuries. 
Geographic Location of Gird-i Ashoan 
The mound lies at UTM X.520062 Y.4057880 at an altitude of 1415 m, at the eastern fringes of the Piranshahr plain, on the east bank of the Lavin River. The northern and western flanks of the mound are about 330m and 450m off the riverbed, respectively. The site is within the boundaries of the modern village, flanked by its buildings. It is a mound with a circular base of about 55 m in diameter. Measuring about 55m north-south and 50m east-west, it occupies a total area of ca. 2750 sq. m. The east and south slopes gently descend against the walls of the villagers’ houses. 

Pottery
Pottery represents the most abundant category in the artefactual assemblage. The pieces are plain, with a profusion of chaff and fine grit added as temper to their fabric, leaving them with a pockmarked appearance, thus the designation “chaff-faced pottery.
The sherds from Gird-i Ashoan have brown, orange, and grey surfaces, are poorly fired, and bear a thick slip, though rare examples of thin slip are also attested. The applied ornamental elements include carved motifs and incised grooves. The ceramics of the Late Chalcolithic III and II are invariably chaff-tempered and handmade.
The pottery falls into three categories: plain, incised and painted. The last is represented by three sherds of Pisdeli type bearing black motifs on a buff ground. As regards morphology, the excavated pieces can be divided into several groups: 1. Open pithoi with everted rim, which are the most common form at Gird-I Ashoan and exhibit the closest ties with different regions of Anatolia, the Caucasus and Mesopotamia. 2. Open bowls. 3. Shallow trays, albeit in extremely limited numbers. 4. Closed jars. 

Architectural Remains
Mudbrick wall: Part of a brick wall (F.1017) was exposed along the southern section of the trench. It began from -2.35 m and continued to the depth of 3.19m. The individual grit and sand tempered mudbricks variously measured 60×40× 9cm, 56×39× 9 cm and 56×32× 9 cm, and ranged from brown-buff to red-brown in color. Both the bricks and the wall oriented north-south. The surfaces of the wall was lined with a clay coating that contained the same grit and sand particles. The small segment uncovered at the center of the trench near the southern section represented the corner of two perpendicular walls: the north-south wall of F. 1017a and the east-west wall of F. 1017b . The associated floor surface was recorded at -3.19m. It consisted of a compacted silt-clay deposit mixed with sand, charcoal particles and ash. In is notable that the floor surface sealed a layer of debris that was accumulated over time. 
At a depth of 3.62 m near the western section, a pottery vessel was found to be intentionally included into a 55×55 cm mudbrick. This poorly fired vessel was made of a chaff-tempered fabric with a black core. Quite interestingly, the embedded vessel was meant to serve as reinforcement.
Mudbrick floor: Near the western section, the mudbrick floor (F. 1021) was encountered at -3.5m. The structure was formed by laying down brown mudbricks of varying dimensions. Recorded were square (55×55cm) and rectangular examples as well as fragmentary bricks set, rather irregularly, into a red -brown clay mortar. In two cases, the mudbricks were reinforced by embedding insufficiently fired pottery vessels of a paste with black core. The exposed part of this flooring extended 0.7m north-south and about 0.4m east-west. A very small part of a second flooring (F.1022) was cleared in the southeast quadrant of the operation at the depth of 3.95m.
With its thick deposit of 8.65m, Gird-i Ashoan sited in the Zab basin represents a key point in northwestern Iran. 

Conclusion 
Excavations of Gird-i Ashoan revealed an LCA deposit, which extended from the depth of 1.00 m down to a depth of -9.65 m. Results from the excavations of the site are indicative of the interactions and cultural similitudes of the occupants of Gird-i Ashoan with northwest Iran, north Mesopotamia, Anatolia and Caucasia. The period is marked by the spread of the technological horizon of Chaff-Faced ware, a widespread cultural phenomenon covering vast territories, (Palumbi, 2011: 211; Helwing , 2012:  204) which displays fairly consistent cultural attributes (Helwing 2012:  207).
The material culture from the site exhibits close relationships with those of the coetaneous centers of the Lake Urmia region, on the one hand, and Anatolia, Caucasia and Mesopotamia, on the other. In effect, given the geographic location of the Zab basin as a cross-regional crossing, we may conjecture that Gird-i Ashoan might have served a transitional role in this communication network. The hypothesis seems to be confirmed by the discovery of the obsidian pieces. To conclude with, observations made at Gird-i Ashoan suggest that in the 4th millennium the Early Chalcolithic III‒II culture reached the Zab region, where it would be eventually replaced by the subsequent Hasanlu VII culture. 

Abstract
Architectural remains are as the “foundation” of archaeological research, these evidence can be described with words, numbers and precise and clear drawings. But the interpretation of architectural remains and worldview contexts related to human social behavior are still problematic. Architecture is related to material remains, but we must remember that ultimately these remains reflect the customs and worldview of the respective societies. There is no doubt that the individual household unit changes successively over time to accommodate nuclear and extended families, groups, tribe, etc. Cheshme Rajab site is located in Lorestan province, Kohdasht County - Konani district, 500 meters north of the Symareh River, 6.5 km from the top of the Symareh dam, and in the cultural domain of central Zagros. It is considered one of the key sites for the study and cultural developments of the rural settlement period of the region and Zagros.  In April 2019, the second season of extensive (vertical-horizontal) archaeological excavations was carried out by creating three trench in the center, west and south of the site in order to know and be aware of the cultural developments in the region in the said Tepe. The current research is based on the presentation of the exploration results, the discussion of its architectural data analysis. This research  is done with a fundamental purpose and its data collection method is based on the field and library method, and in it, while introducing and describing the architecture of this site, we seek to answer the questions regarding the architectural condition of this site, such as whether it is right-angled and... Which period does the site belong to? Also, based on the results of the archaeological excavation, it can be said that in terms of the obtained works, it belongs to the late Neolithic and Chalcolithic Period.
Keywords: Symareh, Cheshme Rajab, architecture, Neolithic Period, Chalcolithic Period.

Introduction
The water catchment basin of the Symareh dam is located at the intersection of the common border of Lorestan and Ilam provinces. Symareh, having a different environment (mountainous, plain and hilly), located in the central Zagros basin and adjacent to the lowlands of Khuzestan and Mesopotamia, has always been the focus of different cultures. In general, due to the special biome and diverse geographical texture of central Zagros, this site has long played a key role between Mesopotamia and Khuzestan and the highlands of central Zagros. The changes of intra-regional (environmental) factors cause the abandonment or burial of villages and hamlets that were formed on the side terraces of the Symareh River, and these developments are important for archaeological research. The presence of small and large terraces of sedimentary deposits, fresh water springs, the use of pasture land, rock shelters, etc., are important factors for the emergence of settlements in this region in the prehistoric period (Introduction). et al., 2017: 3). In the meantime, the excavations of the Symareh dam basin have provided valuable information about Neolithic and Chalcolithic Period cultures. In the investigation and identification of the cultures of the Symareh dam basin, Cheshme Rajab site in 2007, by Abbas Moghadam and colleagues; the first season was explored by stratification but did not reach the virgin soil, the second season of archaeological exploration was carried out in 2010 by Abdul Reza Mohajeri Nezhad. According to archaeological research and excavations, most of the settlements during human settlements since prehistoric times have been located in line with water resources that have suitable environmental conditions. Therefore, the catchment site of  Symareh River is not exempt from this case. In 2007, the investigation and rescue excavations of the Symareh dam were able to investigate many ancient sites and clarify the time period of ancient times. Also, the Cheshme Rajab site is one of the important and key sites of the Symareh basin for investigating the process of cultural developments during the realization period of the Zagros region. One of the goals and necessity of the research in the Cheshme Rajab site is to investigate and analyze the architectural findings obtained from the Chalcolithic Period of this site. The main question of this research is trying to determine which cultural period the architecture obtained from Cheshme Rajab’s surroundings by examining the settlement style belongs to. Based on the results of archaeological excavations, it can be said that in terms of the obtained works, it belongs to the late Neolithic and Chalcolithic Period.

Research method
The current research has a qualitative and strategic system and is based on fundamental goals and is historical in terms of method. The method of data collection has been carried out in two ways: field and library. In the field method, the desired samples have been examined and studied. The basis of analysis relies more on internal information and findings, and the second method is a library that draws conclusions by matching and comparing data at the same time and by matching and analyzing them.

Discussion
The people living in Cheshme Rajab lived in rectangular houses. The main materials used in the construction of houses are materials such as crushed stone (river), mud mortar and plaster, which are taken from the natural bed of the region and due to the easy access and experience of the residents of the region, in angular and almost rectangular spaces, as a unit. They have used a building in rammed floor or rubble and almost regular clays and a mold that was a combination of straw, sand and river mud. According to the time frame of Cheshme Rajab, from the beginning of the Neolithic period, it seems that since this time, due to the easy access to stone, they have started to build buildings with stone carcasses, which have taken a step towards monotony (old village settlement). The obtained architectural remains indicate the construction of angular chambers made of crushed stone with a floor of rammed earth and sometimes cobblestones were used. The coherent architecture that was obtained from Pit 1 has not been observed in any of the contemporaneous sites in central Zagros, also in Pit 2, evidence of an industrial trench was found, which is unique in its time period and can be a sign of a specialized society. In this trench, several clay sherds were found, which were probably a sign of a spinning trench. Such Spindle Whorl in the Symareh basin were previously also reported from Chararo, but there was no discussion about the existence and acquisition of the trench (Hessari et al., 2012: 94), the emergence of these evidences either from the Rajab Spring or from Chararo itself. It shows the emergence of an advanced society that they created a spinning trench, although Henrikson, by studying the architectural structure of Tepe Segabi A in the Godin VII period, believes that this structure was a mass production trench and a skilled and expert group was engaged in it (Henrickson, 1988: 10) And later Badler and Rothman were also of the opinion that at the end of the Middle Chalcolithic Period and the beginning of the late Chalcolithic Period in the Godin VII period, Zagros-centric societies are passing from simple and equal societies to rank societies (Rothman & Badler, 2011: 80).Despite the fact that in the west of Iran, simple village-dwelling and herding communities live and we do not see evidence of social complexity and inequality in them (Mohammadi-Qasarian, 2021: 19), at the same time, in the northern and southern Mesopotamia, we see large site that reach up to 15 hectares in size. (Trentin, 2010). The round temples in Erpachie and the big temples in Eridu indicate the formation of societies with social complexity (Stein, 2012: 130). This issue is also true in the southwest of Iran (Holl, 2002: 178), while no signs of social complexity and progress can be observed in central Zagros (except Cheshme Rajab & appeh Chār Ārou) at this time, even the spread of Dalma pottery and the similarity Together, they raise the hypothesis for some researchers that maybe this pottery was produced in a certain center and was distributed throughout Zagros (Henrickson & Vitali, 1987: 40), but so far there is no work that confirms this hypothesis. Among the materials found in Cheshme Rajab, it can be a proof of an advanced society.

Conclusion
The Symareh River is a river that drains the entire region and the change in its behavior has had a tremendous impact on the geology of the region and the way humans have settled. Due to the strategic location of the Symareh Valley in the west and southwest of the Iranian plateau, it has been considered as an intercultural communication route since ancient times. The location and geographical conditions (Symareh alluvial valley, great heights of Kabirkoh and its pastures, Symareh river, alluvial and rich lands of the region) have provided ideal conditions for agricultural life and animal husbandry in the region. According to the obtained architecture, the residents of Cheshme Rajab have settled in right-angled houses with a rectangular layout and the use of natural materials of the site. The main materials used in the construction of houses are irregular rubble and molded clay with mud mortar. Inside the architectural spaces, there are traces of ovens, food storage pots, the existence of their large objects and counting objects, which are direct evidences regarding the storage system of the residents of the site during the Chalcolithic Period.An architectural space for industrial activities with clay flooring, clay Spindle whorl, works of pottery kilns, welding kilns and pottery that fell due to high heat, which shows that architectural spaces were used for industrial activities in addition to residence. During the Chalcolithic Period, like in other sites, especially central Zagros, the inhabitants of the site gathered bodies under the floor of residential spaces and buried small decorative objects and children inside burial vats. Other findings obtained in the site, such as obsidian blades, show the connection of the residents of this site with other places (Northwest and Anatolia) and the presence of clay Spindle whorl are direct evidence of the advanced spinning activities among the residents. Also, according to geographical conditions and environmental factors, the existence of extensive pastures in the site and spinning spindles are indirect evidences related to animal husbandry activities among the residents of the site.