The Moon and Axelrod

Axelrod gave him his first set of coordinates and Ingo found himself in darkness. He began trying to make sense of the impressions he was acquiring. While I seem to be near a cliff of some kind, it goes upward, quite high, made of some kind of dark rock. There is whitish sand, a fluffy kind of sand. Away from the cliff formation, there's a broad expanse of some kind. What do the patterns look like? Axelrod seemed to be looking at me in a rather strange way, as if swallowing a desire to speak. Well, I went on what they actually look like are like rows of largest tractor tread marks. But I don't understand