It has been fun and I'll close with this:
I believe a lot more credit should be given to the mesolithic peoples. A pattern of very detailed knowledge of there domain is coming to light. It seems that there was a cycle to their roamings that was very organised, travelling in a circle (ish) throughout the year and returning to the same location a year later.
As much as the farmers came to rely on the sun, stars and moon for harvests, the mesolithic people also needed to know when flocks would fly over or when herds would pass by a certain place.
There is a train of thought that says that aspects of their 'uncivilised' way of life, that of subsistance and not raping the land through agriculture etc., was far more civilised than many aspects of our lives today.
It's been fun.