GR translation: the hollow of an upended trunk

[Bekah]

It's out of the ground, for sure - whether it's on its side or not is a ? but I'd say probably - I mean,  how else? 
http://www.everystockphoto.com/photo.php?imageId=3409766


Bekah

On Jun 30, 2013, at 9:29 AM, David Morris <fqmorris at gmail.com> wrote:

> Yes, but upended trunk is more likely on its side.
> 
> On Sunday, June 30, 2013, Mike Jing wrote:
> P371.12-19   Sure enough, in the hollow of an upended trunk, long roots fringing the scene like a leprechaun outpost, Slothrop finds one Emil (“Säure”) Bummer, once the Weimar Republic’s most notorious cat burglar and doper, flanked by two beautiful girls, handing around a cheerful little orange star. The depraved old man. Slothrop’s on top of them before they notice. Bummer smiles, reaches up an arm, offering the remainder of what they’ve been smoking to Slothrop, who receives it in long dirty fingernails. Oboy. He hunkers down.
> 
> Does this actually refer to a tree trunk that's standing upside down and partially hollowed out?