Abstract
Analyzing why and how food collecting and production has been occurred in past societies has always been one of the main archaeological and anthropological research question. This work is done using archaeological finds, especially pottery. In this research, we tried through study of Yaqut Tepeh pottery usage to understand the socio-livelihood situation of East Mazandaran from the 4th to the 2nd millennium BC. In terms of use, potteries were divided into three categories: kitchen wares, food storage containers, and daily uses containers. Various variables such as clay, construction stages, decoration and form have been considered. Chi-Square and Kruskal-Wallis tests were used to analyze the relationship between the mentioned variables and the relationship between the use of pottery and each of the locus consequently. The socio-economic situation is the specific question of eastern Mazandaran communities from 4th to 2nd millennium BC. Probably this event took place in the east of Mazandaran, which is the intersection point of different cultures and the gateway to the Gorgan Plain and Central Asia on the one hand, and the southern slopes of Central Alborz and the Shahrood, Damghan, and Semnan plains through the mountainous plains, has happened. There is a significant relationship between kitchen pottery and food storage containers with some locus; but this relationship is very weak on daily uses containers. In the middle of the settlement and lifetime in this site, more and more diverse pottery was produced and a certain standard and legality was observed in the production of pottery. The variety of uses of containers as a sign of increasing the diversity of the diet can be one of the reasons for the social and subsistence life of Yaqut Tepeh community to become more complicated from the third millennium BC onwards.
Keywords: Social Life and Livelihood, East of Mazandaran, Yaqut Tapepeh, 4th to 2nd Millennium BC, Pottery Usage.

Introduction
Since pottery is the most abundant and perdurable archaeological data, it is necessary and useful to study it in various dimensions and aspects. Recording, description, classification, typology, seriation, and analysis of pottery are very important. In fact, the detailed study of pottery, as well as posing questions and hypotheses, creates a strong analytical foundation for explaining cultural changes, and archaeological interpretations and explanations. If at this stage, archaeologist doesn’t succeed obtaining a relative scientific understanding of the pottery collection, the subsequent studies, including the technical and laboratory investigation methods, will not produce reliable scientific results. Therefore, understandings the function of pottery for social, economic and religious-ritual (cognitive) reconstructions are based on this stage, and basically, the laboratory study of pottery, which itself leads to the material culture knowledge, produce quantitative and technical data for confirmation and support of the mentioned reconstructions. The high abundance of pottery in ancient contexts provide the opportunity to learn about why and how this material became important and even the sanctity of this material among generations and the study of lifestyle changes, regional and extra-regional communications, the socio-economic status, beliefs, customs, rituals, symbols, and familiarity with the perceptions of the ancients the archaeologist (Shepard, 1974; Orton et al., 1993; Costin, 2007; Roux, 2019; Criado-Boado et al., 2023; Shortland & Degryse, 2019). 
From the 4th millennium BC, fundamental changes took place in the West Asia; large settlements using the irrigation-based agricultural system emerged; the level of knowledge and specialties had reached its maximum growth; innovations such as rapid pottery wheel and the production of more diverse stone tools and implements emerged; early governments tried to expand their political and economic influence in wider geographical areas; and communities in different regions were trying to participate in these social and economic developments.
The Gorgan plain and eastern Mazandaran plains played their role in the cycle of social and economic activities of the 4th millennium BC (Cleuziou, 1986; Deshayes, 1968). Pottery and its related technologies are important data that are useful to explain the aforementioned developments in this region.
The present article main aim is the studying the usage of pottery on reconstruction of the social and livelihood situation in eastern Mazandaran plains from the 4th millennium to the beginning of the 2nd millennium BC based on the unearthed pottery from Yaqut Tepeh excavation.

Discussion
In order to study the socio-livelihood situation of Yaqut Tepeh, it is necessary to determine the usage of pottery, and therefore, the technology of pottery making must be studied first. The study of pottery clay (texture and amount of temper), the stages of making pottery (external and internal surface of pottery), decoration and its relationship with the form of pottery can determine the usage of wares. In this article, the relationship between these variables has been measured using the Chi-Square and Kruskal-Wallis tests. Based on the results of this tests, there is a significant relationship between them. Therefore, Yaqut Tepeh pottery is divided into three categories in terms of usage, which include: kitchen wares, food storage containers, and daily uses containers. Kitchen wares have temper and has a rough texture. These potteries are resistant and shockable due to temperature change and sudden impact. Another feature of these containers is the faster heat transfer. The form of these potteries is cauldron, drainage and cauldron cap (?). Cauldrons are of several types; two colors, single color and big cauldrons. Daily uses containers are in many different forms and have more decorations.
Food storage containers are in the form of bulgy jars and open mouth jars, each of which is divided into different categories. Each of these pots had a different use. Some were used for short-term food storage and others for long-term food storage. The relative chronology of the pottery, which was done by comparing them with the pottery of the neighboring areas, shows that the oldest settlement in Yaqut Tepeh appeared in the Middle Chalcolithic; Locus 15 of trench 9 potteries are comparable to Hesar II pottery in terms of manufacturing technique, design, and form. Settlement in this site continued until the Iron Age. Yaqut Tepeh have had trans-regional connections since the beginning. The red and gray pottery of the Gorgan plain has also been seen in this site.

Conclusion
Based on the relative chronology resulting from potteries and the arrangement of locus, the settlement in Yaqut Tepeh started almost from the Middle Chalcolithic and continued until the Iron Age. Due to its location in eastern Mazandaran, it has the possibility of more communication with the Gorgan plain and the central plateau of Iran. We said before that recognition the usage of potteries plays an important role of understanding the aspects of social life and livelihood of the ancient communities. This issue has been addressed by using the technical studies and Chi-square and Kruskal-Wallis tests. 
The potteries were divided into three categories including kitchen wares, food storage containers, and daily uses containers. Pottery paste (texture and temper), manufacturing techniques, decorations and forms were the basis of this classification. All potteries with a rough and sandy texture because of their resistant to temperature changes and sudden shocks has been used for cooking. Therefore, in addition to the cauldron, there have been other wares among the kitchen wares, including drainage, open-mouthed jars, and cauldron cap. Due to the large size of food storage pots, a little temper is used in them; because temper prevents the pottery from cracking during drying. These potteries are undecorated. Pottery with daily use is very diverse and often delicate and decorated. 
The relationship between these wares and locus was measured in order to study social and livelihood developments; a relatively strong relationship has been identified between the form of kitchen wares, food storage containers and locus. But there is not much connection with food storage pots. The aforementioned tests and pottery technology have shown that certain rules and standards have been common for production of pottery in Yaqut Tepeh. The variety of pottery from the Middle Bronze Age shows the dynamism of this community. The hypothesis of the site inhabitants diet diversity also shows their social and livelihood complexities. 
The current research is an initial step recognizing and defining the concept of society from Middle Chalcolithic to Iron Age in eastern Mazandaran, where there isn’t much knowledge in this field. Naturally, a foundation has been created for future research.