I am a little confused. They found those civilisations on the alien planet and they all have the same pictogram? Or are they saying that our ancient earth civilisations have the same pictogram?
The same with the map: they find it on earth in a cave, or on the alien planet? Cause if they find on the alien planet and imediately after all hell breaks loose, i guess they don't have time to go and follow the map, unless they are already planning the sequel and have the story figured out wich i doubt.
So far i'm thinking that pictogram isn't a invitation but a warning, stay away from that place, and that is why Shaw is so sorry. It is also reminiscent of the alien signal in ALIEN, when they misinterpreted it