All Cratons and Shields

This group collects the Structural and Tectonic Formations subcategory's members that are cratons and shields, the ancient, stable and often extremely old cores of continental crust that have resisted major tectonic deformation for hundreds of millions to billions of years. These are among the geologically oldest features in the subcategory, providing the stable platforms on which much younger structural and sedimentary features elsewhere in this atlas were later built.