(from the article `Carlsbad Caverns National Park`) ...Monarch, one of the world`s tallest columns (89 feet [27 metres]), and a delicate rimstone dam (natural dam formed by the accumulation of calcium ... Found on http://www.britannica.com/eb/a-z/l/28
(from the article `Carlsbad Caverns National Park`) ...Monarch, one of the world`s tallest columns (89 feet [27 metres]), and a delicate rimstone dam (natural dam formed by the accumulation of calcium ...