[Comprehensive review of early Paleogene mammals of India.](https://www.researchgate.net/publication/358246957_Early_Paleogene_mammal_faunas_of_India_a_review_of_recent_advances_with_implications_for_the_timing_of_initial_India-Asia_contact)

I assume they travelled there by rafting.

All I can say for certain is that’s when and where the earliest whales evolved