1. A point where a mathematical function becomes nondefined [16].
   2. An unconformity in which the bedding planes above and below the break are basically parallel, indicating a significant hiatus in the orderly sequence of sedimentary rocks.
   3. A surface at which seismic-wave velocities abruptly change.

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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