As far as I recall Alex, they did not have access to suitable ingredients for mortar, and as a bonus, walls and buildings are free
to move about a bit during earthquakes. We seem to be having a private viewing session between the three of us; I do hope other people aren't getting irritated at my hogging the terrestrial section. If anyone is, please say so.
Chris, the pic is foreshortened by the zoom lens; the mountain
in the background is actually about 7 or 8 clicks away. Have you read
my PM?
cheers raymo