BGS Rock Classification Scheme
Chalk - A friable and porous limestone. British Geological Survey Research Report RR/99/03, section 3.1 and fig. 6.
| Code | CHLK |
|---|---|
| Description | Chalk - A friable and porous limestone. British Geological Survey Research Report RR/99/03, section 3.1 and fig. 6. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Friable & porous sedimentary rock with particles >50% calcite/aragonite largely of biogenic origin such as coccoliths. Usually white, particle size not defined but commonly fine-grained, 0.032 to 0.25mm. Limestone. |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/CHLK |
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.