アルモリカ山塊
The timing of the tectonic movements is based mainly on comparisons with lithologically and structurally similar terranes in the Armorican Massif (Chantonnay Syncline in the Vendée) and in the Rouergue. In the southern Armorican Massif the dextral shearing motions are timed as Namurian and Westphalian (Serpukhovian till Moscovian), i.e. 325 till 305 million years ago. One can therefore propose for the deformations in the Thiviers-Payzac Unit of the Bas-Limousin, which is regarded as the southeastern prolongation of the Vendée, a middle to late Carboniferous age. Similar ages for the leucogranites in the northern and central Limousin seem to support this assumption.