Analysis of the Ecosystem and the Natural Geography of the Eastern Bank Plains of Alvand and its Role in the Lack of Absorption of Primitive Humans Communities (Based on Archaeological Studies)

Present research is a wide reflection of coordination of archeology and geography based on different geographical components to examine the geography role in forming human communities with the wide view and to introduce catcher of its role in absorbing and non-absorbing primary societies. The emergence concept of primary societies should be analyzed based on geography that from this perspective, geography of eastern bank plain of Alvand is less considered that includes large area of Hamadan province with different mountain plains and basins surrounded in different bumps and folds such as: Hamadan–Bahar, Ghahavand, Kaboudrahang and Razan-Famenin plains to Avaj mountains. By deep study of Alvand eastern bank, two factors, placing this basin in the cold and dry geography with respect to its height degree from the sea level (1500 to 2000 m) and also lack of source and mines of raw material outcrops (ChertStone) for supplying tool industry in periods of primary societies (Paleolithic to Neolithic), are the most important factors of non-absorbing settlement of human primary societies in this basin that explained in the following.
Present research is descriptive-analytical based on two library and field method, so that it has explained climate and geography of eastern Central Zagros and Alvand Eastern bank based on written sources left by travelers, historians and geographers and then addressed on geographical studies and classifications explained by contemporary researchers of geography and in the field studies area, addressed analysis of ecosystem and natural geography of Alvand Eastern bank plains and its role in non-absorbing habitats of human primary societies based on field findings of the plains archeology by examining types of geography and consequences of environmental conditions with a view to the vegetation, animal coverage and its role in forming primary deployments climate and natural environments understanding of Alvand Eastern banks from the perspective of geomorphology and ecosystem in non-absorbing primary deployments in answer to these questions: What is the role of geography in archeology studies? What is effect of natural geography of Alvand Eastern bank plains on absorbing and non-absorbing human primary society deployments?
The most obvious feature of Central Zagros heights is their wrinkle and being tattered, apparent conformity of geological structure and ripples form are seen as a large number of parallel northwest-southeast mountain ranges. Alvand Eastern bank is studied as a part of natural and cultural basin of “East Central Zagros” in archeology literature. Alvand mountain range in its north- west to south-east direction acts as a natural limiting factor and in political classifications in two western and eastern basins acts as a buffer zone between Central Plateau and Central Zagros and created the connected plains in its eastern bank (east and northeast) and is among the condensation plains and is granite formation from the geomorphological perspective that formation of caves and Karstic shelters is not possible in it. Generally, weather of Alvand Eastern bank is variable despite of high mountains, rivers, abundant spring and ups and downs. So, air of this basin has cold winters (similar to weather of Younger Dryas) with low water and moderate summers. So, it has not favorable conditions for presence of human primary societies (Paleolithic and Neolithic), because, yet, despite of archeology studies carried out in the set limit of Alvand Eastern bank plains, no reporting is obtained about deployments of Paleolithic and Neolithic. With respect to the life style based on hunting and deployment of the human in the cave and natural shelters, Alvand Eastern bank plains ecosystem and natural geography has not environmental conditions of human primary societies and findings of archeology have introduced formation of human primary societies in this basin from Bronze Age.
Present research results are concluded in two main and basic points by geographical examining and analyzing of Alvand Eastern bank by archeological approach. First, from ecosystem perspectives (vegetation and fauna); any region has deep dependence to the natural geography and its weather and base on conducted examination and study, the most important factor of non-absorption is the climate weakness and impropriate geography of natural environment in Alvand Eastern bank whit high height degree of the region that the plains of the basin show higher than 1500 m from the sea level (average height 1700 m from sea level) this bank has the slope and mountains that are factor on the lack of natural environment and plain and unfavorable lands for agriculture (Especially in Neolithic Age). In addition to above points, regions of Alvand Eastern bank with respect to its cold and dry climate (Similar to Weather of Younger Dryas) have low capabilities for forming Pre-Neolithic and Neolithicdeployment. Second, from geomorphology perspective (Geomorphological Formation) type of most plains of the research, especially Alvand mountain range unlike high Zagros is Granite formations in which it is impossible to from caves and Karstic shelter. So, if deployment of the human groups, least in the form of seasonal in the region, it should be in the open place that most of places are completely covered due to young sediment of the late Pleistocene and Holocene period. Also, in relation to the lack of the deployments from Neolithic periods in the high plains of Eastern bank of Alvand and with respect to the height, it has high frigidity and more cold duration. So, it is impossible to deploy human life and use of its resources until Chalcolithic periods and progress in the architectural technique to overcome living conditions. This is only took place from Chalcolithic periods to the next. Therefore, this reason is the effective factor for the lack of deployment of Pre-Neolithic and Neolithic periods. From the raw materials of stone industrial, presence of mineralogical composition and locating Eastern bank of Alvand and large part of Hamadan province in "Iranid" region (and absence of outcrops of Cherty Stone) have caused lack of law materials for producing required tools of stone industrial of stone communities (Paleolithic and Neolithic) which this problem has also been important reason in the absence of primitive human communities.