[gusgus01]

Another Fun Fact: the Appalachian mountains formed before sharks existed, the rings of Saturn existed, and before bones existed.

[dredmorbius]

But they're (possibly) younger than the New River!

<https://en.wikipedia.org/wiki/New_River_(Kanawha_River_tribu...>

(Blew my mind when I first encountered this a few years back.)

[sethammons]

I think you misstated your fun fact

[abc123abc123]

...but younger than the mountains. There you go!