Carolina Environmental Diversity Explorations

Lonely mountains · By Dirk Frankenberg

Erosion

Figure 6. Quartzite erodes in curved forms like these. (Photograph by the author. More about the photograph)

Another interesting feature of the quartzite is the way it erodes. Its rate of erosion is slow, and thus so is the monadnock’s erosion beneath it. But when it does erode, it forms curved surfaces that geologists call “spherical or curved weathering.” Figure 6 shows examples of this type of weathering as it occurs at the top of the little pinnacle of Pilot Mountain.

Definitions

quartzite n.
A metamorphic rock composed of firmly cemented quartz grains, or formed from metamorphized quartz sandstone. [more]
monadnock n.
An isolated hill or mountain of resistant rock rising above an eroded lowland. [more]
weathering n.
The natural chemical or physical alteration or change of an object or deposit through time.
pinnacle n.
A tall pointed formation, such as a mountain peak; the highest point; the culmination.