Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian


Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_2219

A shield is generally an area of exposed Precambrian (or Pre-Nanhuan) crystalline basement, such as the Canadian Shield, Superior Shield and Baltic Shield. Because the rock exposed in a shield is very old, it has particular significance for revealing the early history of the Earth.

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