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  1. Craton, or shield.
  2. The core of a continent, a vast tract of
  3. highly deformed metamorphic rock around which
  4. the continent has been built. Intense
  5. mountain-building periods shook these shield
  6. areas in Precambrian times before stable
  7. conditions set in. Cratons exist in the
  8. hearts of all the continents, a typical
  9. example being the Canadian Shield.
  10.