The New York-New Jersey Highlands, or Highlands region, in the county's eastern section is older, created from geological forces applied towards Precambrian igneous and metamorphic rock formations approximately 500 million to 1.15 billion years ago.
The New York-New Jersey Highlands, or Highlands region, in the county's eastern section is older, created from geological forces. These geological forces were applied towards Precambrian igneous approximately 500 million to 1.15 billion years ago. These geological forces were applied towards metamorphic rock formations approximately 500 million to 1.15 billion years ago.