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Mud stalagmites are not a depositional form, like standard stalagmites, but instead form by erosion. If water drips onto a mud-covered slope, it may drill holes and leave sharp, pointed edges around them. Most mud stals have very sharp peaks. Similar stals may form in sand or clay. Another type of stal is formed where gravel or small pebbles cover mud, sand, clay, or gypsum. An individual pebble, more resistant to erosion, protects the material beneath and a pillar forms with the cap-rock perched on top. This mechanism is similar to towers on a much larger scale seen in areas of the Colorado Plateau.
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