Caltrans Glossary
discontinuity
"A general term for any mechanical break or fracture in a rock mass …. It is the collective term for most types of joints, weak bedding planes, foliation planes, fractures, faults, and discrete shears."

Definition from the "Caldecott Improvement Project: Geotechnical Baseline Report," prepared by Jacobs Associates, June 2009. 100 pp.

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