1.   That should have been it -- the mill falling in on itself or being torched by vandals, leaving only a rock foundation.

2.   The site, officials said, is on a firm rock foundation chosen after an exhaustive search.

3.   People living along the Nile have noted similar decay patterns in the rock foundations of their homes, Stephenson said.

4.   The rock foundation had worn away and cracks had split all four main walls.