New evidence from the Tømmerås area requires redefinition of the extent of development of the Offerdal Nappe in Trøndelag. Särv and Seve units are recognized in the area. The Seve Supergroup and Särv Nappe have previously been shown to wedge out westwards, being largely restricted to Swedish territory. These units reappear as very large-scale lenses in Trøndelag. This evidence substantially increases estimates of nappe displacement. At the same time it emphasizes the importance of flattening (gravitational collapse) during the late-stage migration of the nappe pile eastwards onto the Baltoscandian platform.
Extension of the Offerdal and Särv Nappes and Seve Supergroup into northern Trøndelag