In the context of the available data on Indian history, the period in between 3000 BC and 1500 BC is a very remote one. For such a longer period, we have only some references of Tamil literature and some oral history based on folklores or just Puranic stories. Apart from it we have only the seals of Indus Valley which were found out only around 1920 AD. Before finding out such seals, many have written history on some presumptions. The earliest source of history for India is only the Data got from the Jatakas and such Jaina or Buddhist literature in Pali language. The Sanskrit language which claims to be the earliest language of the world, could not give us any Inscriptional data before 2nd or 4th century AD, whereas the Tamil language and the Prakrit, which is now almost proved to be a form of Thamizhi (Prof. Velayudha Perumal Chellam) gives us inscriptional samples even beyond 6th century BC. Modern researchers and linguists have almost proved, or at least have formed the opinion that the so called Vedic Language and Vedic Literature, all been the original Tamil or Dravidian materials which have been just rendered in a newly coined language in a very later stage. Of course, there are too many objections to the acceptance of this theory. But this theory is going to form the foundation of new evidences going to come on the basis of modern scientific analysis in the future. So we are not to neglect it right away. Now the point is, why these things are referred to here in the context of the history of Nadars? Yes these factors are brought to our notice, because, it is on solving these problems, that the history of Nadars would rest upon. Anyway, the scientists or the historians have to account for the antiquity of the Nadars as proved by the Genetic Science.
Sometime ago it was believed that the Incas, or the Red-Indians (Native Americans) had no history at all. But it has been proved now or, rather claimed now, that they had almost a history of 40,000 years, if not more. This is calculated roughly from the organic contents in the soil akin to animal and human inhabitation in this areas where they had lived. But, at the same time it has been strongly suggested and almost proved that those 'Native Indians' were the early immigrants from north-eastern parts of India or Asia through a Mongolian belt, crossing over Bering Land Bridge which got exposed during the Ice Age from c.75,000 BC to c.8000 BC, entering Mexico and southwards, etc, or through the Pacific coasts. If it is accepted so, the question arises, where was their origin? There is another theory, as believed by some branch of the aboriginals of America that they were a branch of the Vedar (Hunting groups) of India. In the Sangam Age, we had such Vedars who were very much linked up with the Nadars called Vettuvan. So the theory of Africo-Lamurian origin of Nadars co-existing with these Veder or Vettuvar helps to solve this problem. The results of genetic analysis also suits this phenomenon.
Archaeological findings have proved that the human inhabitation in northern India is lagging behind almost by 3000-5000 years, than compared to Southern India. The period of Indus Valley civilization is almost fixed to be as around 3000-1500 BC. So, logically, the Lamurian people, through Southern parts of India, and also through the eastern parts, have moved farther northwards much earlier than 3000 BC and had formed a great Civilization there which had thrived at least for 5000 years. The fact that 'Tamil Linguistic Pockets' still existing in Northern regions like Baluchistan, Kashmir, etc., strengthens this movement of the Tamils to the northern and to far eastern regions in such a remote period. Incidentally, one Inscription given by a Kashmiri King in a Pandya / Chera territory of the Tamils, at Cheraman Devi in the present Tamilnadu, (of course, in a later period) also helps to strengthen this argument.
It has been the opinion of some of the researchers who had conducted physical verification of the soil of some regions of the Himalayas that the huge percentage of sandy soils present there lead to infer the region was once occupied by the Ocean on a very remote period. Whether the Indus Valley had been destroyed by such a deluge is to be further thought out and confirmed. However, the Scripts found in the Indus Valley Seals, to the extent of deciphering done, is learnt to be early Dravidian or Tamil. Many Tamil words have been found there like 'Arasan, Ko, Perumal, Niithi, Velan etc.(Prof. Mathivanan), also help us to confirm, or at least to think that the Tamils were occupying those regions in these period. Calculating the Culture, Mastery of Arts, Science, literary evidences equipped with the scientific evidences of antiquity, all vouch for the NADARS existing in the whole of India during these period. This is supported by the historical report during the times of Alexander the great that one branch of NADARS namely the Ganas (Kana) have strongly resisted his advance farther in India, for the strong presence of Nadars in the period in question., as Warriors or even as Rulers.