The riverbed of the Tavignano river just west of Corte offers three-dimensional exposures of strongly deformed metamorphic rocks.
In the riverbed, just ca. 500 m west of the city, we can observe chlorite-rich metamorphic rocks that contain brighter felsic and darker mafic layers. In places, those layers were deformed to so-called boudins. These boudins (French for sausage or bulge) are formed under extensional deformation of layered rocks. During ductile shearing or fracturing, the stronger layers, which are more resistant to deformation, thin or completely separate to isolated rounded structures. The boudins in this outcrop have a high content of glaucophane.