Angoulême shares border with La Couronne
Geology
Geologically the town belongs to the Aquitaine Basin as does three-quarters of the western department of Charente.
The commune is located on the same limestone from the Upper Cretaceous period which occupies the southern half of the department of Charente, not far from Jurassic formations beginning at Gond-Pontouvre.
The earliest Cretaceous period - the Cenomanian- is in the relatively low areas (l'Houmeau, the heights of Saint-Cybard, Sillac), at an average altitude of 50m.
The city was established on the Plateau (altitude 100m) that dominates the loop of the River Charente, a Turonian (also called Angoumien) formation which forms a dissected plateau of parallel valleys and a cuesta facing north that extends towards La Couronne to the west and Garat to the east.
This limestone plateau contains natural cavities which have been refurbished by man in the form of three or four floors of caves, some of which include antique grain silos.
The valley of the Charente is made up of old and new alluvium which provides rich soil for farming and some sandpits. These alluvial deposits were deposited successively during the Quaternary period on the inside of two meanders of the river that are Basseau and Saint-Cybard. The oldest alluviums are on the plain of Basseau and reach a relative height of 25m.
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