Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Hierapolis-Pamukkale' has mentioned 'Limestone' in the following places:
Occurrence Sentence Text Source
The ruins were slowly covered with a thick layer of limestone.
Later in 2020, city layer of limestone was broken and fixed after 2 months.
After the large white limestone formations of the hot springs became famous again in the 20thxc2xa0century, it was turned into a tourist attraction named "Cotton Castle" (Pamukkale).
The auditorium was rebuilt as well, substituting the ancient limestone seats with others in marble, and realizing a high podium on the orchestra in order to adapt the building to the organization of venationes and gladiator schools.
Most of about the 1,200 tombs were constructed with local varieties of limestone, though marble has been used, as well.