Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Grand Canyon National Park' has mentioned 'Precambrian' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| The Grand Canyon, including its extensive system of tributary canyons, is valued for its combination of size, depth, and exposed layers of colorful rocks dating back to Precambrian times. | WIKI |
| Criterion (viii): Within park boundaries, the geologic record spans all four eras of the earth's evolutionary history, from the Precambrian to the Cenozoic. | UNESCO |
| The Precambrian and Paleozoic portions of this record are particularly well exposed in canyon walls and include a rich fossil assemblage. | UNESCO |