Wow - I think I'm going to have to read that again!
Many years ago I was on a desert trip with one of the last Australian Great Explorers - Len Beadell, before he died. He took us to a series of stones he had found. They were all carved at the base and had other carved stones place around them to hold them vertical. They were all placed in a perfectly straight line across a naturally cleared area. He had been trying to find their origin but had never succeeded. He knew all the local Aboriginal tribes very well and none of them were able to explain where they came from. He never showed many people where they are and to this day the mystery continues. He navigated by the stars so was very good with directions etc. The ONE amazing fact was that the line of stones was 100% aligned to true North / South (not magnetic).

I've got an old super 8 video somewhere I might convert to digital and see if I can do post on it.

Thanks for reminding me about it with your post.