Structural and metamorphic discontinuities in the Tømmerås basement-cover sequence confirm the allochthonous character of the Lower Snåsa Group, the Leksdalsvann Group, and the upper basement of the Tømmerås Window. Three major deformational events are recognized. During an early event the upper unit (the Snåsa Group amphibolites and gneisses) was metamorphosed under amphibolite facies conditions and thereafter became emplaced above the unmetamorphosed Leksdalsvann sediments. The interkinematic (D1-D2) parageneses of these sediments indicate a highPH2OandTca. 450°C. D2 recrystallization, corresponding to the transitional greenschist-amphibolite facies (500–550°C,P> 600 MPa), is largely controlled by the distribution of shear strain. Calcium-rich mantles of late D2 garnets in the same sediments indicate a pressure peak before the main thrusting (late D2). D3 folded the thrusts and the isograd pattern established during D2 around the NE-SW trending axis of the Tømmerås Antiform. Various features indicate the subordinate role of Caledonization in the Tømmerås ‘autochthon’: the decrease of grade with increasing tectono-stratigraphic depth, the open megastructures and the mylonites and localPT-peaks. This is noteworthy because Tømmerås is located on the very border of the coastal gneiss region, an area previously supposed to have been subject to Caledonian mobilization.