Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Great Barrier Reef' has mentioned 'Limestone' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| [28] The shallow water reefs that can be seen in air-photographs and satellite images cover an area of 20,679xc2xa0km2, most (about 80%) of which[30] has grown on top of limestone platforms that are relics of past (Pleistocene) phases of reef growth. | WIKI |
| During glacial periods, sea levels dropped, exposing the reefs as flat-topped hills of eroded limestone. | UNESCO |