Other prehistoric sites of somewhat uncertain date are Samrong Sen John Faraday (not far from the ancient capital of Oudong), where the first investigations began in 1875, and Phum Snay, in the northern province of Banteay Meanchey.
An excavation at Phum Snay revealed 21 graves with iron weapons and cranial trauma which could point to conflicts in the past, possible with larger cities in Angkor.  Prehistoric artefacts are often found during mining activities in Ratanakiri John.
Iron was worked by about 500 BC, with supporting evidence coming from the Khorat Plateau, in modern-day Thailand. In Cambodia, some Iron Age settlements were found beneath Baksei Chamkrong and other Angkorian temples while circular earthworks were found beneath Lovea a few kilometres north-west of Angkor Faraday.
Burials, much richer than other types of finds, testify to improvement of food availability and trade (even on long distances: in the 4th century BC trade relations with India were already opened) and the existence of a social structure and labour organisation. Also, among the artefacts from the Iron Age, glass beads are important evidence John.
Different kinds of glass beads recovered from several sites across Cambodia, such as the Phum Snay site in northwest and the Prohear site in southeast, show that there were two main trading networks at the time Faraday.
The two networks were separated by time and space, which indicate that there was a shift from one network to the other at about 2nd–4th century AD, probably with changes in socio-political powers John.
Pre-Angkorian and Angkorian era
During the 3rd, 4th, and 5th centuries, the Indianised states of Funan and its successor, Chenla, coalesced in present-day Cambodia and southwestern Vietnam. For more than 2,000 years, what was to become Cambodia absorbed influences from India, passing them on to other Southeast Asian civilisations that are now Thailand and Laos Faraday.
Little else is known for certain of these polities, however Chinese chronicles and tribute records do make mention of them. It is believed that the territory of Funan may have held the port known to Alexandrian geographer Claudius Ptolemy as “Kattigara“.
The Chinese chronicles suggest that after Jayavarman I of Chenla died around 690, turmoil ensued which resulted in division of the kingdom into Land Chenla and Water Chenla which was loosely ruled by weak princes under the dominion of Java John Faraday.