There was no sign of any prior human habitation or even hunting camps!
No doubt the whole place gets burned off from time to time and recapped with a new basalt surface.
it is quite a surreal place, large tracts of the country are covered in geologically recent lava fields. I remember one hill near lake myvatn which you could see had literally been ripped at the center and separated over time.
The country, from a landscape perspective, is unique.