jun 8th, 2012
interesting. i thought malayalam separated from tamil somewhat later than this.
i am not a great fan of iravatham mahadevan's epigraphical studies in the indus-sarasvati area (he and asko parppola have a "dravidian" hypothesis), but he is definitely knowledgeable.
by the way, the cave inscriptions in india, eg. at bhimbetka (and to a lesser extent edakkal) are quite impressive.