BGS Rock Classification Scheme - Text search results
115 records found. Please click on a code for a "thumbnail" definition.
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| Description | Code |
|---|---|
| Miscellaneous hydroxide, oxide and silicate metasedimentary rock | +#*MHS |
| Miscellaneous hydroxide, oxide and silicate sediment and sedimentary rock - In the Rock Classification Scheme, these are subdivided into two main groups: monomineralic aluminium-silicate, and hydroxides and oxides of alumina and iron. British Geological Survey Research Report RR/99/03, section 9. | +*MHSS |
| Sediment and sedimentary rock - In the Rock Classification Scheme, this high level class includes siliciclastic sediment and sedimentary rock, carbonate sediment and sedimentary rock, phosphate-sediment and phosphorite, iron-sediment and ironstone, organic-rich sediment and sedimentary rock, sedimentary rock and sediment composed of non-carbonate salts, non-clastic siliceous sediment and sedimentary rock, miscellaneous hydroxide, oxide and silicate sediment and sedimentary rock, sedimentary rock based on grain size or crystal size, and hybrid sediment and sedimentary rock. British Geological Survey Research Report RR/99/03. | +*SSR |
| Ankerite-gravel - A type of ankerite-sediment. In the Rock Classification Scheme, it is one in which over 25% of clasts are larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 3.2, table 6 and fig. 7. See also: silicate-gravel. | ANGV |
| Ankerite-mud - A type of ankerite-sediment. In the Rock Classification Scheme, it is one in which over 75% of the clasts are smaller than 32 µm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 3.2, table 6 and fig. 7. See also: silicate-mud. | ANMUD |
| Ankerite-sand - A type of ankerite-sediment. In the Rock Classification Scheme, it is one in which clasts are predominantly 32 µm to 2 mm, with less than 75% of the clasts smaller than 32 µm and less than 25% larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 3.2, table 6 and fig. 7. See also: silicate-sand. | ANSA |
| Arenite - A type of silicate-sandstone. In the Rock Classification Scheme, arenites have 0 - 15% matrix. British Geological Survey Research Report RR/99/03, section 2.2 and fig. 3. | AREN |
| Breccia - A type of silicate-conglomerate. In the Rock Classification Scheme, this term may be used for conglomerates made of sharply angular clasts. British Geological Survey Research Report RR/99/03, section 2.1 and fig. 2. Synonym: angular silicate-conglomerate. | BREC |
| Calcsilicate-rock, granofelsic | CALGNF |
| Calcsilicate-rock, schistose | CALSCH |
| Calcsilicate-rock, gneissose | CALSGN |
| Calcsilicate-rock - A type of metasedimentary rock composed largely of calcsilicate and/or carbonate minerals. In the Rock Classification Scheme, it is one in which the modal calcsilicate mineral content exceeds the modal abundance of carbonate minerals. British Geological Survey Research Report RR/99/02, section 3.2 and fig. 7. | CALSIR |
| Calcsilicate-rock, mylonitic | CALSMY |
| Calcsilicate-rock and psammite | CAPS |
| Calcsilicate-rock and semipelite | CASP |
| Calcsilicate-rock, metalimestone and calcareous semipelite | CMLC |
| Conglomerate - A rudaceous sedimentary rock based on grain size or crystal size. See: silicate-conglomerate. | CONG |
| Pelite, calcareous, and calcsilicate-rock | CPCS |
| Silicate-mud, calcareous | CSIMD |
| Mylonitic calcsilicate-rock, amphibolite and gneissose semipelite | CSMAGS |