In northern Victoria Land, the boundary between Bowers and Robertson Bay terranes is characterized by the Millen Schist, that are a high strain belt, costituted by two superposed elements. The upper element is made up of mafic metavolcanites that strongly recall the Glasgow Volcanics. The underlying element comprises filladic schist and minor metagraywacke that recall those of the Robertson Bay arenaceous sequence. The two elements of the MS are in contact by a thrust surface: detaild structural analysis revealed a consistent top to NE sense of shear. The southwestern boundary between Millen Schist and Bowers Terrane is known as the Leap Year Fault, but the fieldwork indicates that this boundary has transitional features and that the Leap Year Fault cut a pre-existing tectonic situation.