Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Megalithic Temples of Malta' has mentioned 'Limestone' in the following places:
Occurrence Sentence Text Source
The external walls were usually built of coralline limestone, which is harder than the globigerina limestone used in the internal sections of the temples.
What remains are the stone paving of the entrance passage, with its perforations, the torba floors,[50] and a large upright slab of coralline limestone.
[56] Its builders used the soft globigerina limestone that caps the ridge to construct the temple.
They used hard coralline limestone for external walls and the softer globigerina limestone for the more sheltered interiors and decorated elements.