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Well thank you Tiompan, it's like the shopkeeper in Mr Ben.
So are those cupmarks from an older use of the stone? And how old do you think the souterrain is? I'm surprised how blocky the walls are, I was expecting something more sophisticated and delicate. But I suppose it depends what stones you have to hand, to some extent.
And (questions questions) do you have to climb in by a metal hatch as canmore dully suggests, or can you go down the steps (which would sound much nicer)?
Cup marked rocks are re-used in souterrains and older monuments but I think these are natural but used in the same way i.e. you also find striking natural rocks in the same contexts . Did the builders know they were natural ? My guess is that they did .
Yep, climb through a hatch in the middle of a field ,hatch is flush with the ground i.e. there's no mound , it's quite a while since I was there but I'm sure there were no stairs