This is my most austere and audacious soundscape. It is not even audible without a sub-woofer.

The Cretaceous-Paleogene boundary is a worldwide band of iridium that marks the Fifth Mass Extinction event, the end of the dinosaurs. It is abbreviated K-Pg (K for Kreide, which is chalk in German). At present we are in the midst of the Sixth Extinction, the Holocene or Anthropocene. It will not be abbreviated, because no language-using species will survive it. The chance of one evolving again is vanishingly small.

John Cage appreciated the value of silence. In his famous 4'33" he notated a piano piece with nothing but rests, so the context surrounding the performance became the focus. Like Robert Rauschenberg's "White Paintings" (which influenced Cage) or Christopher DeLaurenti's "Favorite Intermissions" (which did not), the figure and ground were reversed, the background became the foreground, and the performance became the very lack of any performance.

Sometimes, late at night when I'm having trouble sleeping, I try to imagine a world without man. "The KG Boundary" attempts to depict such a landscape, shortly after mankind has extincted ourselves. It presents the sounds of our absence, right on the "Cage-y" boundary.

It is a still place, a very quiet place, a place no longer troubled by our imperfect species. Our self-annihilation is coming not from any nuclear "bangs" as envisioned during the Cold War, but from the "whimper" of our own unwise many-generations-long failure to live sustainably.

And as the track title indicates, the Earth－and time itself－will of course go on for a long time after we're gone.

After all my Urban Soundscapes, in which I said human sounds are not noise pollution, I wanted to envision a soundscape completely devoid of us. Or anyone else, for that matter. It was inspired by the memories of AUSS27.
auss.bandcamp.com/album/urban-soundscape-27-lincoln-city

Details on the contents are behind the track title.

In 2016 Robert Rich had much the same idea, but he was much more optimistic about what species would survive:
robertrich.bandcamp.com/album/what-we-left-behind