The Thiviers-Payzac Unit, sometimes still called Thiviers-Payzac Nappe or Bas-Limousin Group, was named after Thiviers and Payzac, two small towns in the northeastern Dordogne situated within the unit's outcrop area.
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Just northwest of Terrasson in the eastern Dordogne there is an upfaulted basement high, that is also included within the main unit.
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The schist crops out in a 3 kilometer wide, slightly curved band that starts at the type locality Donzenac and extends to Lanouaille.
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The unit starts just west of Thiviers in the northern Dordogne and then follows for 70 kilometres a semicircular arc segment, passing through Lanouaille, Payzac, Orgnac, Donzenac and finishing just east of Brive in the Corrèze.
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The prekinematic Saut-du-Saumon orthogneiss is a 15 kilometer long, very drawn out, squid-like, NW-SE-striking granitic body, whose tail starts at Donzenac in the south and whose tentacles end in the Orgnac region near the river Loyre.
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The main production shaft, at an elevation of 250 meters above sea level, can be reached by following a small valley on the left side of the D 707 Nontron- Thiviers just before arriving at Neuil.