On Thu, 19 Mar 2015 08:53:17 -0700 (PDT), JimK wrote:

So you think the massive stones that go at the base below ground
level
move and so the rest of the wall above falls down?

Well the footing stones of the wall we are having rebuilt have moved

How does one decide that?

'Cause the line of the base of the wall is mostly straight but
sections deviate from that line in the downhill direction.

--
Cheers
Dave.