BGS Rock Classification Scheme - Text search results
44 records found. Please click on a code for a "thumbnail" definition.
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| Description | Code |
|---|---|
| Carbonate sediment and sedimentary rock - In the Rock Classification Scheme, carbonate sediments and rocks are defined as rocks in which the carbonate component forms more than 50% of the sediment or rock. For a rock to be termed a carbonate sedimentary rock, the 50% carbonate criterion should not include any carbonate cement in an originally non-carbonate rock. The class is divided into lime-sediment and limestone, dolomite-sediment, dolostone and magnesite-stone, and Na carbonate sedimentary rock, defined on the basis of the carbonate composition. British Geological Survey Research Report RR/99/03, section 3. | +*CSSR |
| Dolomite-sediment, dolostone and magnesite-stone - In the Rock Classification Scheme, these are defined as carbonate sediments and sedimentary rocks which are dominantly (> 50%) composed of a magnesium carbonate in the form of dolomite (CaMg(CO3)2), ankerite (Ca3 (Mg2Fe) (CO3)6) or magnesite (MgCO3. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | +*DSRM |
| Ankerite-boundstone - A dolomite-boundstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKBST |
| Ankerite-framestone - A dolomite-framestone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKFST |
| Ankerite-grainstone - A dolomite-grainstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKGST |
| Ankerite-microstone - A dolomite-microstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKMCST |
| Ankerite-microsparstone - A dolomite-microsparstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKMSPT |
| Ankerite-mudstone - A dolomite-mudstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKMST |
| Ankerite-pseudosparstone - A dolomite-pseudosparstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKPSPT |
| Ankerite-packstone - A dolomite-packstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKPST |
| Ankerite-sediment - In the Rock Classification Scheme, this is a dolomite-sediment where it is known that the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKSED |
| Ankerite-sparstone - A dolomite-sparstone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKSPT |
| Ankerite-wackestone - A dolomite-wackestone in which the carbonate is composed dominantly of ankerite. British Geological Survey Research Report RR/99/03, section 3.2 and fig. 7. | AKWST |
| Dolomite-boundstone - A type of dolostone, classified on the basis of its biogenic texture. It is a dolostone in which the original components were bound and encrusted together by the action of plants and animals in the position of growth. British Geological Survey Research Report RR/99/03, section 3.2, table 7 and fig. 7. | DLBST |
| Dolomite-carbonatite - A type of carbonatite. In the Rock Classification Scheme, this term may be used when a modal classification is possible. In a dolomite-carbonatite more than 90% of the carbonate is dolomite. British Geological Survey Research Report RR/99/06, section 6.1 and fig. 25. See also: magnesiocarbonatite. | DLCBT |
| Dolomitised limestone and dolomite | DLDO |
| Dolomite-framestone - A type of dolostone, classified on the basis of its biogenic texture. It is a type of reef rock consisting of a rigid framework of colonies, shells or skeletons. Internal cavities are filled with fine sediment. British Geological Survey Research Report RR/99/03, section 3.2, table 7 and fig. 7. | DLFST |
| Dolomite-grainstone - A type of dolostone, classified on the basis of its depositional texture. It is a grain-supported dolostone with little matrix (mud-grade material smaller than 32 µm). British Geological Survey Research Report RR/99/03, section 3.2, table 7 and fig. 7. | DLGST |
| Dolomite-gravel - A type of dolomite-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. | DLGV |
| Dolomite-microstone - A type of dolostone, classified on the basis of its diagenetic texture. It is similar to dolomite-sparstone but with crystals smaller than 4 µm. Crystals are not resolvable under an optical microscope. British Geological Survey Research Report RR/99/03, section 3.2, table 8 and fig. 7. | DLMCST |