Dear Shivsomashekar
If you consider yourself as the final authority, be happy with the same.
However if you have some distance to go till you achieve that vaunted position, I would suggest you to study as a apart of your research the following :
1. The books of David Frawley and others in respect to Aryan / Dravidian.
People in North India are normally lighter skinned than south India which is out of normal process of climate. It is a general phenomenon as one moves from equator to pole.
2. The DNA study on the flow of humans to this sub-continent. It debunks both - Aryan invasion and the percieved divide Aryan / Dravidian
3. As regarding Gulf of Cambay look for it in Google - you will find it. I was part of the Institute which carried out the study.
I hope the researcher in you will take interest in finding out these facts.
Added some sites of interest :
http://new.modernrationalist.com/201...of-s-m-khodke/
http://www.archaeologyonline.net/art...n-history.html
http://www.sabha.info/research/aif.html
http://archaeology.about.com/od/indu...s/a/aryans.htm
http://clubs.ncsu.edu/hsc/hsc/Events...eb_21_2007.pdf
http://indiatoday.intoday.in/story/i.../1/163645.html
http://www.east-west-dichotomy.com/s...3-max-mueller/
http://www.stephen-knapp.com/solid_e...n_invasion.htm
http://www.scientificamerican.com/ar...tory-of-humans
http://www.dnaindia.com/india/report...theory_1623744
http://home.iitk.ac.in/~amman/articles/DNAbased.html
http://www.archaeologyonline.net/artifacts/cambay.html
http://www.ancientworlds.net/aw/Article/1099190
http://www.grahamhancock.com/forum/B...ryanB1.php?p=1
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