BGS Rock Classification Scheme
Fault-breccia - A type of mechanically broken rock without primary cohesion. In the Rock Classification Scheme, a fault-breccia is not foliated, and contains angular to rounded fragments that comprise more than 30% of the rock which are significantly coarser than the matrix, and are composed of mechanically broken rock fragments and/or mineral grains. British Geological Survey Research Report RR/99/02, section 7.1 and table 3.
| Code | FBRC |
|---|---|
| Description | Fault-breccia - A type of mechanically broken rock without primary cohesion. In the Rock Classification Scheme, a fault-breccia is not foliated, and contains angular to rounded fragments that comprise more than 30% of the rock which are significantly coarser than the matrix, and are composed of mechanically broken rock fragments and/or mineral grains. British Geological Survey Research Report RR/99/02, section 7.1 and table 3. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Deformed (brittle), unfoliated rock; no primary cohesion, (protolith undefined) in which angular/rounded fragments (>30%) are significantly coarser (>0.25mm) than the matrix |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/FBRC |
CAVEAT
"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.