RIMSTONE

A deposit formed by precipitation from water flowing over the rim of a pool.
Found on http://www.cancaver.ca/docs/glossary.htm

Rimstone

Rimstone, also called gours, is a type of speleothem (cave formation) in the form of a stone dam. Rimstone is made up of calcite and other minerals that build up in cave pools. The formation created, which looks like stairs, often extends into flowstone above or below the original rimstone. Often, rimstone is covered with small, micro-gours on hor...
Found on http://en.wikipedia.org/wiki/Rimstone
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