Cursus? I don't know. My findings so far are that they vary greatly in length and they often don't seem to go anywhere. The Neolithic was such a weird place that I wonder if they didn't suffer from collective insanity! Nothing seems to make any sense at all - and that is why I'm putting the books aside for awhile and trying to clear other 20th century views from my head. We know nothing for certain do we? Why Silbury Hill? Why are long barrows long with all the bodies up at the front? Why the horns and the false entrances? Why circles? Why sausage shaped trenches in circular causewayed camps? The Neolithic is just one big WHY? It really comes down to a question of practicality or religion. Did they build to mange their lives better or were they driven by mad priests, kings or magicians? Reason or unreason?