was a cave formed by erosion or deposition
Erosional caves can be found in almost any kind of rock, from hard granite to soft claystones, and even including limestone. In fact erosion can be a very active process in caves originally formed by solution caves as well, but usually occurs after the cave has drained and surface streams are pirated into the cave.Erosion tends to produce tall, canyon-like passages.Running water on glaciers may sink into crevasses and melt a path through the glacier to form glacier caves. These often show pronounced scalloping on the walls and ceilings, and are often decorated with ice formations.andstone is soft and readily eroded. In some areas wind has sculpted large (but not deep or extensive) caves, as the one on the left. Note the large sand dune below the left-hand entrance. On the right is a smaller cave with extensive wind sculpting from Castle Rock State Park in California.