Chiang Ban Chiang () is an archaeological site in Nong Han District, Udon Thani Province. Dating of the artefacts using the thermoluminescence technique resulted in 4420-3400 BCE dates. The oldest graves found contain no bronze and are therefore from a Neolithic culture, the most recent ones are from the Iron Age. Khok Phanom Di Khok Phanom Di is in east Thailand near the flood plain of the Bang Pakong River in Chonburi Province. This site was populated from 2000-1500 BCE. Seven mortuary phases were identified in the excavation, including 154 graves, yielding abundant archaeological remains, such as fish, crab, hearths, post holes, and the burials of adults and infants. By analysing the change in mortuary practices and the isotopes of strontium, carbon, and oxygen found within dental remains, archaeologists have examined the possibility of integration between an inland agriculture with the coastal hunter-gathers of Khok Phanom Di. The isotopic studies showed that in earlier phases, the female inhabitants in the site were immigrants from both inland and coastal areas, while males were raised locally. The localisation of the immigrants occurred during phase 4 and later, with rice growing increased in the same period. Khao Rakian Khao Rakian is in Rhattaphum District, Songkhla Province, peninsular Thailand. The cave was excavated in 1986 by the Fine Arts Department and revealed Neolithic ceramics, stone tools, and human skeletal remains. 2,500 years ago: Bronze Age Copper and Bronze Age The Bronze Age was a period in civilisation's development when the most advanced metalworking consisted of techniques for smelting copper and tin from naturally occurring outcroppings of ore, and then alloying those metals to cast bronze. There are claims of an earlier appearance of tin bronze in Thailand in the 5th millennium BCE. Bronze Age settlements in Thailand Ban Chiang In Ban Chiang, bronze artefacts have been discovered dating to 2100 BCE. The earliest grave was about 2100 BCE, the most recent about 200 CE. The evidence of crucibles and bronze fragments have been found in this area. The bronze objects include ornaments, spearheads, axes and adzes, hooks, blades, and little bells. 1,700 years ago: Iron Age The Iron Age was the stage in the development of people in which tools and weapons whose main ingredient was iron were prominent. People made tools from bronze before they figured out how to make them from iron because iron's melting point is higher than that of bronze