Hydrogeological Unit (0)
Lithology (1)
| UNCONSOLIDATED |
| Sand and clay |
|
| PARTLY CONSOLIDATED |
| Sandstone and clay |
| Claystone and sand |
| Marl |
|
| CONSOLIDATED |
| Sandstone |
| Sandstone and claystone |
| Claystone |
| Shale |
| Limestone and marlstone |
| Limestone |
|
| BASEMENT |
| Schist and quartzite |
| Granite, gneiss, and schist |
| Plutonic rock |
|
| Plutonic rock (basic) |
|
| Plutonic rock (acid) |
| Volcanic rock (basic) |
Cover (2)
| Alluvial and fluvial deposits, HP: porous, high: >10 l/s |
| Alluvial and fluvial deposits (Inner Delta, Adar Doutchi), LP: porous, low: 0.5-2 l/s |
| Alluvial and fluvial deposits, arid regions, TP: porous, limited: 0.1-0.5 l/s |
| Aeolian deposits (ergs, dune complexes) |
| Aeolian deposits (sand sheets) |
| Lacustrine and beach ridge deposits |
Basin or structural unit (3)
|
| BASINS |
| Bassin de Keta |
| Bassin de Tano |
| Litoral Atlantique |
| Bassin sénégalo-mauritanien |
| Bassin du Tchad |
| Bassin des Iullemmeden |
| Bassin de Taoudeni |
| Bassin de la Bénoué |
|
| BASINS (cont.) |
| Bassin Bové |
| Bassin du Volta |
| Bassin du Djado |
|
| STRUCTURAL UNIT |
| Zone mobile trans-saharienne (Chaîne pharusienne) |
| Bassarides & Rockelide Belt |
| Dahoméyides |
| Bouclier benino-nigerian |
| Craton ouest-africain |
Depositional or rock formation environment (4)
|
| SEDIMENTARY |
| coastal |
| continental |
| continental & marine |
| marine & continental |
| marine |
|
| METASEDIMENTARY |
| continental |
| continental & marine |
| continental & marine, volcanic |
| marine & continental |
| marine |
|
| BASEMENT |
| Archean basement (plutonic and metamorphic complexes) |
| Archean basement: (meta)volcano-sedimentary |
| Eburnean basement (plutonic and metamorphic complexes) |
| Birimian terranes: (meta)volcano-sedimentary, deep water basins |
|
| BASEMENT (cont.) |
| Pan-African Mobile Belt, (meta)volcano-sedimentary |
| Pan-African terranes: (meta)volcano-sedimentary |
| Pan-African basement (plutonic and metamorphic |
|
| IGNEOUS ROCKS |
| extrusive/volcanic (mafic) |
| intrusive/plutonic rocks (felsic) |
| intrusive/plutonic rocks (mafic) |
| intrusive/plutonic rocks (undiff.) |
Degree of consolidation (5)
| unconsolidated sediments |
| partly consolidated rocks |
| consolidated, sedimentary rocks |
| consolidated, metasedimentary rocks |
| consolidated, metamorphic rocks |
| consolidated, igneous rocks |
Aquifer flow type (6)
| intergranular (porous) |
| intergranular / fractured |
| fractured |
| fractured (karst) |
Aquiferproductivity (7)
|
| POROUS FLOW |
| HP (porous, high: >10 l/s) |
| MP (porous, moderate: 2-10 l/s) |
|
| FRACTURED FLOW |
| MF (fractured, moderate: 2-10 l/s) |
|
| LF (fractured, low: 0.5-2 l/s) |
| TF (fractured, limited: 0.1-0.5 l/s) |
|
| POROUS AND FRACTURED FLOW |
| HM (mixed, high: >10 l/s) |
| MM (mixed, moderate: 2-10 l/s) |
| LM (mixed, low: 0.5-2 l/s) |
| TM (mixed, limited: 0.1-0.5 l/s) |
|
| KARST |
| HK (karst, high: >10 l/s) |
| MK (karst, moderate: 2-10 l/s) |
| TK (karst, limited: 0.1-0.5 l/s) |
|
| ESSENTIALLY NONE |
| NM (mixed, insignificant: <0.1 l/s) |
|
| NF (fractured, insignificant: <0.1 l/s) |
Typology of carbonate rocks (8)
| carbonate rocks, karst |
| carbonate rocks |
| calcareous rocks |
| likely occurence of calcareous strata |
| no mentioning of calcareous strata |
|
| basement |
| no data |
|
