Re:Live feed from Iceland erupting volcano [video]
by btach on Tuesday March 23, 2021 @05:55AM
(#26553032)
A trail around Mt St Helens (Trail of Two Forests, https://www.wta.org/go-hiking/hikes/trail-of-two-forests) has that kind of thing. There is a short tunnel you can crawl through - two trees were laying 90 degrees to each other overlapping when covered with lava. The entrance reminded me of a scene of a typical campy B horror movie (No! Don't go in that cave! The Monster is in there!) I wish I thought to scream to my wife when I crawled in (pretending the Monster got me) -- only thought of it later :-).
Now, what's left is a bunch of hollow tubes that are castings of the trees. You can still see the texture of the bark.
I assume this sort of thing exists in other lava flows around the world.