BGS Rock Classification Scheme
Sedimentary rock based on grain size or crystal size - In the Rock Classification Scheme, if the composition of a sedimentary rock is unknown it may be simply classified by reference to its clast or crystal size. For clastic rocks, the classes are defined in the same way as the siliciclastic sedimentary rocks. British Geological Survey Research Report RR/99/03, section 10 and fig. 13.
| Code | SR |
|---|---|
| Description | Sedimentary rock based on grain size or crystal size - In the Rock Classification Scheme, if the composition of a sedimentary rock is unknown it may be simply classified by reference to its clast or crystal size. For clastic rocks, the classes are defined in the same way as the siliciclastic sedimentary rocks. British Geological Survey Research Report RR/99/03, section 10 and fig. 13. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Sedimentary rock, clast/crystal/particle size, composition & mode/environment of deposition not defined. |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/SR |
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.