Abstract
Gorieh site located in Zarneh section of Ivan Gharb city is one of the important Sassanid and early Islamic sites in archeological studies of the west of the country which has been excavated in 2015. During a season of excavation in this ancient site, a variety of cultural artifacts were found, including pottery, and due to the importance of pottery and its role in archaeological studies, this cultural material was studied in this article. Therefore, for this study, 127 pieces of pottery from the Sassanid era, from 1500 pieces of pottery obtained from excavation, were selected for study. Initially, these pottery were classified typologically based on their technical characteristics and shape or form. This research has a fundamental nature with a descriptive-analytical approach and the method of this research has two parts: library and field studies (pottery). The main purpose of this article is to study the quantity and quality of Sassanid pottery in Gorieh area, then their typology, classification and relative chronology. Chronology has been done comparatively and cultural relations with adjacent areas have been explained based on comparative studies of pottery. The results showed that among the identified forms among the pottery of Gorieh area, including Ewer, jug, bowl, cup and plate and the most common decorative patterns of pottery are carved patterns. Pottery is often suitable for baking and a sign of oven temperature control for baking pottery, and the quality of their construction is generally average. Also, a comparative comparison showed that in terms of relative chronology, Sassanid Gorieh pottery is relatively similar to the areas of the late period. Therefore, while having some local characteristics, the pottery of this area with areas such as, Qasr-e-Bonsar, Hajiabad, Sassanian sites identified in the survey of the Mahneshan of Zanjan, North Khuzestan, Mianab Shushtar, Bushehr, Ras al-Khaimah and Tal-e mahuz sites, Abu Sharifa in Iraq They are comparable and in addition to the influences of regional style, it is most similar to the cultural sphere of southwestern Iran.
Keywords: Typology, Classification, Sasanian Potteries, Gorieh Site, Ilam.

Introduction
Gorieh area is located in geographical coordinates of 38s x: 605380 and Y: 37522210. This site is located 50 km northwest of Ilam, Zarneh district in Ivan city, about 800 meters south and southwest of lower Sartang village. (Khosravi, 1395: 32) Gorieh region drowned in water after impounding of Kangir dam in year of 1394 AH. (Fig. 2) Part of the Zagros Mountains, which overlooks to Mesopotamia and the plains of Khuzestan, is now called Ilam Province. Pottery is the most abundant cultural material in archaeological excavations and studies. Pottery is mostly used for relative dating and to know the cultural and trade relations of the ancient sites. (Khosrozadeh et al., 1399: 119) Therefore, in the present study, the Authors try to introduce and study the pottery findings as one of the cultural materials discovered from the excavation of Gorieh site, which was excavated by one of the Authors of the article, with other sites at the same contemporary.

Discussion 
Masbezan was one of the Sassanian provinces during the rule of Ardeshir Babakan (ruled 244-241 AD) (Rawlinson, 1362: 44); in historical books, this province has been recorded in two forms: ((Masbezan)) and ((Mah, sebzan)). The word Mah or May in the word ((sabzan)) is the changed form of the word ((Mad)) which means city (Qara Chanlu, 1360: 31-32) and the change of the word Mad to Mah and May, which was done during the Parthian and Sassanian eras, was also a common word in the Islamic period for refer to Iraq and non-Arabic places. (Ibid: 32) During the early centuries of Islam, western Iran in the terms of geographical divisions was considered as Jabal province (mountain) in. (Fig. 1) among the cultural findings of the excavation in the Gorieh site, a number of pottery obtained from different spaces. In the present study, from hundreds of Sassanian pottery pieces obtained by screening method, Index pottery was selected from 127 pieces and then categorization, typology and chronology were proposed. Most pottery was made using the wheel-making technique and most of them are sufficiently baked; the pottery s are made entirely of mineral chamotte (sand). In terms of the quality of the pottery s, the earthenware of Gorieh area can be divided into three groups: 1. medium 2. Average 3. Rough. In the present study, the studied samples are pottery s from ancient textures and spaces which cognitively obtained and representative of all classes and species, these potteries were selected accordingly and then discussed and analyzed. Therefore, from a comparative study conducted in a chapter of archeological excavations in Gorieh area, the number of pieces was selected separately: 96 rim, 1 pipe, 4 handles, 18 body and 8 pottery bottom Sassanian unglazed pottery s in terms of color of the dough are divided in three main groups: pea near to green (79 of 127 pieces), pea (20 of 127 pieces), red (19 of 127 pieces), brown (7 from 127 pieces) and gray (3 out of 127 pieces). In addition to the above, for the classification of pottery s which studied in Gorieh, the shape of their rims has also been considered. Accordingly, the rim founded pieces are classified into separate groups: gutters shape, triple, compact, standing and round, round inward or outward, quadruple, and flat .The highest rim diameter among Ceramics is 400 mm and the lowest is 40 mm, in terms of rim type’s number, the highest type of rim is the rounded rim. The pottery bottoms are divided into three groups: flat (Table6, numbers 1 and 3), legged bottom (Table6, number 4 to 7) and upright bottom (Table6, number 2), and handles are in two circular shapes (Table6, number 9 to 11) button shapes, (Table6 number 8) and a container tube (Table6 number 12) are separable Motifs and decorative elements of Gorieh pottery’s can be divided into four categories: 1. Simple patterns (stump) 2. Composite patterns 3. Added patterns and 4. Compression patterns.
The studied potteries, as mentioned before, is placed in common (simple) type in terms of construction and technical characteristics. In the present study dishes, based on the general shape of the earthenware and the type of edge are divided into different shapes of jug, crock, bowls, plates and cups.

Conclusion 
In each cultural region, the quality and quantity of archaeological data provide the basis for archaeological evaluations. The exploration, typology, and chronology of the potteries of a Guriyeh region were carried out to answer the research questions. The technical characteristics of the pottery show that sand is used in its composition. What is clear is that most of the potteries were fired sufficiently, and some of them were fired insufficiently, which indicates the lack of heat control in the pottery kilns. Most of the potteries studied in the present study were in the medium group, showing the tendency of the residents of Guriyeh to use vessels with medium elegance. The majority of the pottery has been made through wheel throwing, demonstrating the use of the potter’s wheel in making pottery; only a few of them are handmade. Wet hand polishing is also observed on the inner and outer walls of most of the pottery. In addition to the polishing of some earthenware, a thin or thick mud layer was also applied on the inner or outer wall and even both walls. In total, several types of pottery, including jugs, crocks, bowls, cups, and plates, were obtained from the Guriyeh area. The comparison of the kinds of pottery with those of other regions showed that pottery with general use, such as jugs (48.96%), is the primary type used by people living in this region. In terms of decorative diversity, Guriyeh’s pottery includes engraved, embossed, and combined motifs. Among them, the use of fingernail pressure to design the pottery seems to be indigenous to the Western region of Iran, and it has not been observed in other areas. Since there is very little archaeological information about Sassanid pottery in the Western region of Iran, the pottery of the Guriyeh area was compared with other regions. Based on comparisons, it was found that the potteries of the Guriyeh area have relative similarity with those of regions at the end of this period, such as (Abu Nasr Palace in Fars, Abu Sharifah Hill in Iraq, and Bushehr surveys). In general, the Guriyeh area was located on two ancient communication routes from Iran to Mesopotamia, as well as a route to the West and Southwest of Iran. Accordingly, Guriyeh’s pottery is comparable to that of other cultural regions of Iran. It can be concluded that based on the available documents, the area of Guriyeh seems to be culturally influenced by the cultural region of Southwest and South Iran, which can be attributed to its specific regional style.