Editing Hydrogeology of Chad

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!colspan="4"|Quaternary-Pliocene unconsolidated sedimentary
 
!colspan="4"|Quaternary-Pliocene unconsolidated sedimentary
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|Undifferentiated
 
||Quaternary
 
||Relatively small outcrops of undifferentiated unconsolidated Quaternary sediments occur across Chad, including alluvium in river valleys, and areas of aeolian sand dunes in the arid north.
 
 
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|Chad Formation
 
|Chad Formation
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The sediment lithology was controlled by the climate during deposition, with wet periods favouring the deposition of clays and diatomites; periods of alternating wet and dry seasons tending to produce sandy deltaic deposits; and dry periods favouring the formation of aeolian sand dunes. The deposits therefore range from pure sand to clayey sand, and include some kaolinitic clays. Abrupt changes in clay and sand content are common, and the sediments usually occur as overlapping lenses.  
 
The sediment lithology was controlled by the climate during deposition, with wet periods favouring the deposition of clays and diatomites; periods of alternating wet and dry seasons tending to produce sandy deltaic deposits; and dry periods favouring the formation of aeolian sand dunes. The deposits therefore range from pure sand to clayey sand, and include some kaolinitic clays. Abrupt changes in clay and sand content are common, and the sediments usually occur as overlapping lenses.  
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Smaller outcrops of Quaternary deposits occur in other parts of the country, including alluvium in river valleys, and areas of aeolian sand dunes in the arid north.
 
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!colspan="4"|Upper Mesozoic sedimentary  
 
!colspan="4"|Upper Mesozoic sedimentary  

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