BGS Rock Classification Scheme

Fault-gouge - A type of mechanically broken rock without primary cohesion. In the Rock Classification Scheme, a fault-gouge may be strongly foliated, and comprises less than 30% fragments lying in fine-grained, commonly clayey matrix. British Geological Survey Research Report RR/99/02, section 7.1 and table 3.

Code FGOUGE
Description Fault-gouge - A type of mechanically broken rock without primary cohesion. In the Rock Classification Scheme, a fault-gouge may be strongly foliated, and comprises less than 30% fragments lying in fine-grained, commonly clayey matrix. British Geological Survey Research Report RR/99/02, section 7.1 and table 3.
Qualifiers No qualifiers currently exist.
Definition Deformed (brittle), foliated rock; no primary cohesion, (protolith undefined) in which angular/rounded fragments (<30%) are significantly coarser than the clay size (>0.004mm) matrix
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/FGOUGE

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.