While hiking along the trail to High Point, watch where you step! As pretty as they are with their moss covering, a misstep could have you stumbling into one of these crevices when you least expect it. While researching what causes them, I discovered the history of their evolution. High Point is part of the Helderberg Escarpment, which is made of limestone. Limestone erodes over time due to water, and the proximity of the crevices to trees, indicates the tree roots took that erosion up a notch causing cracks. Continued rainwater flowing into the cracks not only expanded the cracks into these significant crevices, the dampness became a breeding ground for the lovely green moss.