Some enclosures used different colored or shaped rocks to decorate walls.
A general overview of Hilltop Enclosures is presented in this video.
Links to other kinds of hilltop sites:
This is a large rectangular site with a double white band on one side and a single white band on another. The single band side is on the edge of a cliff. The rest of the structure faces open areas on top of a butte. Up until now our definition of prehistoric fort had been blocked access either by cliff or core veneer rubble filled wall. The sites often had skewed entryways and loopholes. It's shape was usually determined by the promontory or peak it was on.
This site appears to use quartz as a building material instead of for decoration.
Promontory fort with band in wall. One of the sites on the Rectangular Enclosures Page has bands made from a different colored rock. (see menu at top)

Close up of wall with shorter rocks used to create band. Look at layer above loophole,
Orange rocks were placed at the base of the outer wall, inside rooms, and rock shelters.

2 orange rocks at the base of this wall
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