All of the landforms on the moon, every mountain range, every depression,
every feature you can see, are impact related.

The Deep Impact mission to comet TEMPEL 1 showed the head of that comet to
have the consistency of a dirty snow bank.

And, in a moving explosion, all of the kinetic energy continues on down to
the ground in the form of a supersonic downdraft shock wave hotter than
the surface of the sun.

The mid tertiary ignimbrite "flair up" is a confabulated, event.

It is surrounded by a radial, out wards flowing, splash curtain of
ignimbrites like an ejecta curtain.

You can mock up a classic science fair scale model of a volcano if you
want to simulate the flows of a gravity attracted density current down
slope.

Except that, in Mexico, only the very first of the fragments on the
leading edge fell into cold atmosphere. The rest fell into already super
heated impact plasma, and just added to the heat.

A century, or more of standard, gradualist, geophysical assumptions have
settled, and solidified, into an impenetrable matrix of unquestioned,
unproven dogma, and mutual inter-assumptive reasoning. And for the most
part, they are convinced that, except for a few minor details, they have
the history of the surface terrain of this planet all worked out.