Previous versions of Thema are still available 1.2 1.1 1.0.
Browse the Thema subject categories hierarchy, or search for a specific term within the hierarchy.
| Notation | Category heading | Add | Mod | ? |
|---|---|---|---|---|
| R | Earth Sciences, Geography, Environment, Planning | |||
| RB | Earth sciences Use for: (all RB* codes) academic, specialist and professional level works. Prefer WN* codes for the general reader. See also: RGB* Physical geography & topography and its subcategories, WN* Nature & the natural world: general interest and its subcategories |
1.3 | ✽ | |
| RBG | Geology, geomorphology & the lithosphere See also: PHVG Geophysics |
1.2 | ✽ | |
| RBGB | Sedimentology & pedology See also: PNC Environmental chemistry, TNCC Soil & rock mechanics, TVBP Soil science & management |
1.2 | ✽ | |
| RBGD | Geomorphology & geological surface processes Class here: erosion, deposition, glaciology, fluvial and aeolian processes etc |
1.2 | ✽ | |
| RBGF | Historical geology Class here: plate tectonics, continental drift |
✽ | ||
| RBGG | Petrology, petrography & mineralogy | 1.2 | ||
| RBGH | Stratigraphy | |||
| RBGK | Geochemistry See also: PNC Environmental chemistry, PNV Chemistry of minerals, crystals & gems |
✽ | ||
| RBGL | Economic geology Class here: petroleum & mining geology |
✽ |
version detail
- An ellipsis indicates a category has more detailed subcategories
- Click on a category description to reveal these ‘descendant’ subcategories
- Indentation indicates the ancestors and descendants of a category
- Click on the ✽ or ? to see or hide the usage notes
- Search for categories (for example ‘celebrity’) using the search field at the top
- Searches are not case-sensitive, and search both the category headings and any notes
- You don’t need to use complete words (eg ‘celeb’)
- You can also search for Thema codes – these searches must be exact (eg ‘MFGV’)
- Click on a search result category to see it ‘in context’ with its ancestor and descendant categories
- A click on ‘Category heading’ or a blank search returns you to the top level of the hierarchy
- Click on the notation to copy the code to the clipboard