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That pillar is 1. remnant of bedrock joining the cave floor and ceiling. not to be confused with a column, which is a calcite deposit. pillars are common in phreatic caves, formed by complexly looping ground-water flow, but may also be left as small oxbow cores of vadose origin. a spectacular group of pillars occurs in the ill-named chamber of columns in the sof omar cave, ethiopia [9]. 2. a column of rock remaining after solution of the surrounding rock. 3. a stalactite-- stalagmite that reaches from roof to floor in a cave; more properly termed a column. 4. a tall thin stalagmite that does not reach the roof of a cave [10]. see column; rock pillar.?

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