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||Typically low mineral content, with total dissolved solids of around 40 mg/l, and low pH of around 5.  
 
||Typically low mineral content, with total dissolved solids of around 40 mg/l, and low pH of around 5.  
 
|-
 
|-
|Komadji series (Maastrichtian to Senonian); Sibang and Azilé series (Turonian); Red and Cap Lopez series (Cenomanian); Madiela series (Upper Albian to Upper Aptian)
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|Komadji series (Maastrichtian to Senonian); Sibang and Azilé series (Turonian); Red and Cap Lopez series (Cenomanian); Madiela series (Upper Albian to Upper Aptian);
 
||Cretaceous: Maastrichtian to Upper Aptian
 
||Cretaceous: Maastrichtian to Upper Aptian
 
||The upper Cretaceous series includes a wide range of sedimentary facies, including clays, marls, sandy marls and marly sandstones, argillaceous sandstones, calcareous sandstones, limestones, dolomites and possibly gypsum. These have variable groundwater potential depending on their lithology.
 
||The upper Cretaceous series includes a wide range of sedimentary facies, including clays, marls, sandy marls and marly sandstones, argillaceous sandstones, calcareous sandstones, limestones, dolomites and possibly gypsum. These have variable groundwater potential depending on their lithology.
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|Groundwater in the Gamba series is of calcium and magnesium bicarbonate type.
 
|Groundwater in the Gamba series is of calcium and magnesium bicarbonate type.
 
|-
 
|-
|Ndombo series; Mvone series; Agaoula series
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|Ndombo series; Mvone series; Agaoula series;
 
||Upper Jurassic to Permian
 
||Upper Jurassic to Permian
 
||The Ndombo series forms a permeable fine-grained sandstone aquifer with conglomeratic intercalations. The highest groundwater potential is in the conglomerate strata and fractured zones. A specific capacity of around 22 m³/day/m and transmissivity of around 20 m²/day has been recorded. To achieve optimal productivity, boreholes need to be quite deep in order to penetrate the conglomeratic strata and/or a sufficient number of fractures. The aquifer receives abundant direct rainfall recharge. Southeast of Cocobeach, the sandstone aquifer becomes confined below Vembo Shales, and artesian conditions occur. Occasionally, artesian conditions of at least 5 m head also occur in the low areas of the plain, where the sandstone aquifer is overlain by tens of metres of clay.  
 
||The Ndombo series forms a permeable fine-grained sandstone aquifer with conglomeratic intercalations. The highest groundwater potential is in the conglomerate strata and fractured zones. A specific capacity of around 22 m³/day/m and transmissivity of around 20 m²/day has been recorded. To achieve optimal productivity, boreholes need to be quite deep in order to penetrate the conglomeratic strata and/or a sufficient number of fractures. The aquifer receives abundant direct rainfall recharge. Southeast of Cocobeach, the sandstone aquifer becomes confined below Vembo Shales, and artesian conditions occur. Occasionally, artesian conditions of at least 5 m head also occur in the low areas of the plain, where the sandstone aquifer is overlain by tens of metres of clay.  

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