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Les leptynites de Vergonzac, dans l'anticlinal de Tulle (Sud Limousin, Ouest du Massif central), appartiennent a l'Unite superieure de gneiss. L'age de mise en place de leur protolithe a ete obtenu par datation U-Pb a la microsonde ionique Cameca IMS 1270 de zircons selectionnes ; il s'etablit a 525+/-12<space>Ma. Cet age est le meme que celui des orthogneiss de Mulatet et des gneiss oeilles...
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