Editing Hydrogeology of Sudan

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|Key Formations||Period||Lithology||Structure
 
|Key Formations||Period||Lithology||Structure
 
|-
 
|-
!colspan="4"|Unconsolidated sedimentary deposits  
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!colspan="4"|Unconsolidated sedimentary deposits (undifferentiated on the map)
 
|-
 
|-
 
|''Quaternary:'' Gezira Formation, Alatshan Formation, Gash deposits
 
|''Quaternary:'' Gezira Formation, Alatshan Formation, Gash deposits
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''Tertiary'': Hudi Chert, Jabya Formation, Mukwar Formation, Hamamit Formation, Abu Imamma Formation, Dungunab Formation, Abu Shagra Formation, Abyad Formation
 
''Tertiary'': Hudi Chert, Jabya Formation, Mukwar Formation, Hamamit Formation, Abu Imamma Formation, Dungunab Formation, Abu Shagra Formation, Abyad Formation
 
||Quaternary to Tertiary
 
||Quaternary to Tertiary
||There are a number of different named formations in this group, which are undifferentiated on the map.
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||The youngest sediments in Sudan include alluvial silts and clays with occasional sands, deposited in the valleys of the Nile and other rivers; Kordofan aeolian dune sands; and black clay plains (UN 1988). They include the Gezira and Alatshan and Gash formations, and have thickness ranging up to just less than 100 m.  
 
 
The youngest sediments in Sudan include alluvial silts and clays with occasional sands, deposited in the valleys of the Nile and other rivers; Kordofan aeolian dune sands; and black clay plains (UN 1988). They include the Gezira and Alatshan and Gash formations, and have thickness ranging up to just less than 100 m.  
 
  
 
Other Tertiary formations are relatively minor and not distinguished on the geological map above. The consolidated Hudi Chert Formation is non-marine and fossiliferous, containing very thin cherts - not more than a few metres - and found in and around the Atbara region.  
 
Other Tertiary formations are relatively minor and not distinguished on the geological map above. The consolidated Hudi Chert Formation is non-marine and fossiliferous, containing very thin cherts - not more than a few metres - and found in and around the Atbara region.  

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