Quiz: What is the geological age of the rocks that make up the Tet October 20, 2025 by Cyrus Thorne What is the geological age of the rocks that make up the Teton range in Grand Teton National Park? Discover more about Grand Teton National Park at our home page. A) 2.7 billion years old B) 1.2 billion years old C) 500 million years old D) 50 million years old Submit Answer