Wonders of the National Parks: A Geology of North America

The Grand Canyon’s 2-Billion-Year Staircase (1x24)

Air date: Oct 22, 2015

Descend into the Grand Canyon, recording the full sequence of strata from top to bottom - a story that takes you from 270-million-year-old limestone formed in a shallow sea to basement rocks that record a mountain-building saga from 1.7 billion years ago.