Excellent observations David! The sun mark's similarity to the gourda mark had come to mind but I didn't make the connections to the moon marks. Note that those are usually back to back )||(, not front to front (||) . Very nice extra-box thinking
Here's a thought that's been bugging me since I saw the axe symbol. I haven't found pictures of any similar double-headed axes used in north Africa. The symbol does however remind me strongly of the "labrys" the axe symbol of the Minoan civilization (see attached).
As always, this can be simple coincidence, but it's fascinating to think that such symbols should persist for so long in cultural memory.
Emanuel