Geology, for all it's complex nomenclature and technical terminology, DOES have some fun words. And, sometimes, you get the chance to combine a couple of fun words together! Behold: HOODOO TAFONI from the Book Cliffs, UT!
Hoodoos are pinnacles of rock caused by caps of resistant lithology that shield underlying sediments from erosion. They tend to look a little rude, and are also (ridiculously) called "fairy chimneys" and "earth pyramids". Tafoni has already been discussed, both at this blog and others. These are erosional features in sandstones that look a little like a bunch of little pits, caused probably by differential weathering.
Hoodoo Tafoni would also make a pretty good band name, when you think about it.