Ligérian
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The Ligérian is a regional geological substage of the Turonian. It designates sediments of the Lower Turonian in western France.
Flat-lying Ligérian in the Nizonne valley, near Champeaux-et-la-Chapelle-Pommier
Horizontal slickolites in Ligérian near Mareuil
Pressure cone from Quinsac
Angoumian
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The Angoumian is a geological group restricted to the northern Aquitaine Basin in France. The group consists of two fossiliferous limestone formations deposited during the Turonian.
Ligérian
…Ligérian, abbreviated as c3a on French geological maps, is the lowest substage of the Turonian. It overlies the Cenomanian and is in turn overlain by the Angoumian. In the northern Aquitaine Basin the Ligérian, also known as the Villars Formation, shows the following stratigraphy…
Simplified stratigraphy of the Angoumian
A rudist biostrome in the Angoulême Formation; Aucors quarry near Beaussac, Dordogne