Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Sassi and the Park of the Rupestrian Churches of Matera' has mentioned 'Volcanic' in the following places:
Occurrence Sentence Text Source
The Sassi are houses dug into the calcarenitic rock itself, which is characteristic of Basilicata and Apulia, locally called "tufo" although it is not volcanic tuff or tufa.