There were three types of rock on the trail on the peak: granite, limestone, and sandstone. Granite is formed from volcanic activity: lava under pressure. The sandstone around in stacked boulders, sheer faces, and grated crags were sand and debris crushed under severe, prolonged pressure. Granite was often speckled with silica and quartz and are used for, you know, countertops. Sandstone doesn’t have industrial use and is used in sculpture. Oh, look! I was looking for this: limestone. You often find it in places like here that was underwater. The white color is from seashells. So, yes, limestone are crushed seashells. And crushed limestone becomes marble. A work of art!