A tall column of cascading flowstone in Oregon Cave National Monument. The interior of a solution cave forms as water containing carbonic acid drips through the ground and dissolves the limestone or marble. Then continued dripping water leaves behind the calcium carbonate mineral as the water evaporates. The mineral builds up over several centuries to create features like this flowstone that looks like a frozen waterfall.
The original wall of a cave is referred to as speleogen, while the mineral deposits added later are called speleothems. So, this flowstone is an example of speleothem formation.
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