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[[File:Tunisia_Geology4.png | center | thumb| 500px | Geology of Tunisia at 1:5 million scale. Based on map described by Persits et al. 2002/Furon and Lombard 1964. For more information on the map development and datasets see the [[Geology | geology resource page]]. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Tunisia geology and hydrogeology map].]]
 
[[File:Tunisia_Geology4.png | center | thumb| 500px | Geology of Tunisia at 1:5 million scale. Based on map described by Persits et al. 2002/Furon and Lombard 1964. For more information on the map development and datasets see the [[Geology | geology resource page]]. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Tunisia geology and hydrogeology map].]]
  
'''Summary'''
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===Summary===
  
 
The north of Tunisia has been extensively affected by tectonic movements, with anticlines and synclines generally trending southwest - northeast, and a series of faults.  
 
The north of Tunisia has been extensively affected by tectonic movements, with anticlines and synclines generally trending southwest - northeast, and a series of faults.  
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|Key Formations||Period||Lithology
 
|Key Formations||Period||Lithology
 
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!colspan="4"|Unconsolidated Sediments
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!colspan="4"|Unconsolidated
 
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|-
 
|Alluvial plains, including Ghardimou,Kalaa Khasba, Oued Guinniche basin (northern Tunisia) and Kairouan and Sfax basins (central Tunisia)
 
|Alluvial plains, including Ghardimou,Kalaa Khasba, Oued Guinniche basin (northern Tunisia) and Kairouan and Sfax basins (central Tunisia)
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|Series of marine and continental formations
 
|Series of marine and continental formations
||Cretaceous - Tertiary - general
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||Cretaceous - Tertiary
||Cretaceous and Tertiary sedimentary formations occur across most of Tunisia. Across the centre and north of the country are many different marine and continental sedimentary formations.  
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||Cretaceous and Tertiary sedimentary formations occur across most of Tunisia. In the south, the two largest formations are the Complex Terminal and Continental Intercalaire (see below). Across the centre and north of the country are many othe rsmaller marine and continental sedimentary formations.  
  
 
Continental sandstones occur in major sedimentary basins across much of central Tunisia, sometimes directly underlying Quaternary unconsolidated alluvium, such as in the Sfax basin and the Pliocene-Quaternary Kairouan basin. Small outcrops of limestone formations, sometimes with marls, dolostones, gypsum and other evaporates, are scattered across northern and central Tunisia, often interbedded with sand formation.
 
Continental sandstones occur in major sedimentary basins across much of central Tunisia, sometimes directly underlying Quaternary unconsolidated alluvium, such as in the Sfax basin and the Pliocene-Quaternary Kairouan basin. Small outcrops of limestone formations, sometimes with marls, dolostones, gypsum and other evaporates, are scattered across northern and central Tunisia, often interbedded with sand formation.
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|-
 
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|Complex Terminal (CT)
 
|Complex Terminal (CT)
 
||Upper Cretaceous - Tertiary
 
||Upper Cretaceous - Tertiary
||The Complex Terminal is one of the two main formations in the south of Tunisia (the other is the Continental Intercalaire, below). It comprises Upper Cretaceous (Senonian and Turonian) carbonate rocks; and Tertiary (Mio-Pliocene) detrital sand formations.
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||Upper Cretaceous (Senonian and Turonian) carbonate rocks; and Tertiary (Mio-Pliocene) detrital sand formations.
  
 
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|Continental Intercalaire (CI)
 
|Continental Intercalaire (CI)
 
||Lower Cretaceous
 
||Lower Cretaceous
||The Continental Intercalaire is one of the two main formations in the south of Tunisia (the other is the Complex Terminal, above). It comprises a continental facies of sands, limestones and clays.  
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||A continental facies of sands, limestones and clays.  
  
 
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