I’m sure someone will figure out how to reverse engineer the sound recorded in various muds that were in turn fossilized. It’ll probably be something like a soil fungus that left traces of a piezo-materal that when exposed to dinosaur calls emitted energy that raised the probability of the surrounding mud to make some transition.

Once we have those calls synthesized we will find out that the so called asteroid impacts were high energy experiments on the part of the Silurians. Humans will attempt the same to a similar result: lather, rinse, repeat.