The map consists primarily of a large footprint, consistent with the feet of a large theropod (think Tyrannosaurus here). In the footprint are the remains of a rather unfortunate creature, possibly a peasant, possibly something else. Whatever it was, all it is now is a puddle of goo with a Stealth Boy in it.
Giant Footprint appears in Fallout.
Behind the scenes
This is a reference to Marv Newland's (very) short film Bambi Meets Godzilla, the content of which you can probably guess from the title.
- Bambi Meets Godzilla - the animated short hosted on YouTube.