The characteristic feature of marble cliffs in southern Idaho is their striking white and colored layers resulting from geological processes over millions of years. These cliffs, prominently found in the City of Rocks National Reserve, showcase a mix of granite and other sedimentary rocks, offering spectacular landscapes. The cliffs attract rock climbers and hikers, providing diverse recreational opportunities due to their unique formations and scenic views. Their geological significance contributes to the understanding of the region's history and ecological diversity.