Even before you get to the entrance of Crystal Cave at Sequoia National Park (CA), there are sights to see. In order to reach the Crystal cave entrance, there is a half mile walk down a paved path that descends the equivalent of a 30 story building (which also means you need to walk up it once the cave tour is over). Half way down you come to a sign that talks about Marble Ridge which can bee seen across the valley from where you stand. The sign states:
Marble Ridge: Beyond is the ridge of marble which Crystal Cave is formed. Behind you is an extension of the same outcrop. Steeply tilted beds of marble, schist, quartzite, and other metamorphic rocks trend northwestward across the upper foothills of the park. They are the remnants of the ancestral Sierra Nevada which was eroded to a low land long before the uplift of the present range. These rocks and the granite that was intruded into them may be observed along the trail.