The “hot steaming primordial soup” probably occurred around 3 billion years ago. This event was around 250 million years ago when there were 4 limbed land vertebrates running around. My theory is that a very large boloid may have punched into Siberia and set off the Siberian Trappes. The same thing may have also happened on the west side of India and set off the Deccan Trappes around 65 million years ago. Google Shiva Crater and Dr. Chattergee. If is apparently much larger than the Yucatan Crater that is getting most of the credit for the dinosaur extinction.
The impact that formed the Yucatan crater may have done the job on its own, but it would surprise to find that it was one of a doublet impact, two or more chunks of the same parent body which had broken up prior to the terminal rendezvous.