As I describe in the Introduction to my book, a tectonic event led to the change in course of the Yamuna and the Sutudri (Sutlej) rivers and the Sarasvati lost it major tributaries. At the same time, a world-wide drought lasting about 400 years, culminated in the Sarasvati drying up, causing a migration crisis.
I found the following recent article in the Scientific American.
The core plot for my book originated in 1991, hence the headline for this post.
For the humor-challenged, think of this as me channeling things that were in the air since 1970 or so — what is new since then is confirmation of the course changes from satellite pictures and confirmation of the drought by ground excavation.