Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Incense Route - Desert Cities in the Negev' has mentioned 'Stone' in the following places:
Occurrence Sentence Text Source
The agricultural fields have been noted on the river banks and hill slopes in Avdat and central Negev where a very large number of water collection cairns built in stone are present.
They are cylindrical in shape with square bases made of stone.