The era of metal in Dong Nai - Part I

​ One of the most important achievements of this era is the resident community prehistoric Dong Nai has gradually grasp and perfect knowledge of metallurgy , construction bronze casting native and professional thanks molten copper that they had " melted " is partially based on the primitive society of stone working tools , constantly increasing power production history and inner strength to conquer and overcome natural " threshold " of civilization .

    However, in the study of world history and Dong Nai are different conceptions of time formation and cultural connotations of this era in Dong Nai . On the other hand , the concept itself is also changing at each scholar , by excavation practices lead to many new discoveries in Vietnam and the region . Starting from the authors called " culture Phuoc Tan " - H. Fontaine , with the initial concept all vestiges of this culture around Bien Hoa old of Neolithic , but only a few years later , he wants to put many relics ( or all ) of the same age . Those who direct Iron Bridge was originally excavated sites considered earlier and Mountain Pottery is a thousand years " post- Neolithic Sites " , but also just a few years later , someone placed it in the early Dong , others considered it is only the opening move of " Neolithic - Copper " . Then there are people visiting the field , picked up one more piece of copper here , and the analysis conducted for Iron Bridge " under the category of research Brass era " . Others use the term to reconcile the Iron Bridge and the nearby sites , such as : late Neolithic ( Late Neolith ) , later Neolithic ( Post Neoith ) , Culture Stone - Copper ( Culture eneolithique ) , or at the same stage many stones etc. .. In practical historical and cultural development of Dong Nai , the first step in this , the participation of copper in warehouses toolmaking materials - weapons of ancient ice loss is not just important , whereas , at the time this piece , stone processing industry flourished in the most mature , and the brass itself though has many advantages over rocks and potentially promote the development of the entire social history , still can not compete with stones . Only new iron eliminates floating ice . " Iron can allow people farming on the wider area , can jungle reclaimed the wider region , causing iron craftsmen have been a hard and sharp tools without stones any type of metal or what is familiar can cope with it " ( F. Engels ) .

    In understanding the current situation , because the defect was more evidence of stratigraphy and geometry lead to different interpretations of science , can only be assigned in the modern era in Dong Nai metal on 3 times Text: stone - Copper , Brass , Iron soon with 2 key areas : the hills and slate - Basalt red earth ; areas downstream along the Dong Nai River Basalt hill area links - alluvial river - sea nearby swamp .​