After 10 million of years of having its hard sandstone surface eaten away by the Chiatsouliao Creek, Taichi Gorge today presents an impressive sight of steep cliffs and quick-flowing waterfalls.
據台大地理系教授王鑫推測，峽谷岩石屬關刀山砂岩，質地堅硬，距今約有一千萬年歷史。它在來勢洶洶的溪水長年侵蝕下，沿途坡降（短距離內地勢突然下降）很大，形成絕崖峭壁、急流瀑布的景觀。