Fold duplexes transfer displacement from a lower to an upper bounding detachment system via trains of folds with broadly parallel geometries. While they have been previously recognised in orogenic systems where are considered be kinematically equivalent imbricating thrust ramps, we here describe the first example gravity-driven fold and (FATS) developed within late-Pleistocene mass transport de...

-First generation structures in greywackes of the Yuso Group from the Cantabrian Mountains of northern Spain show a distinct variation in geometry with depth in a regional synclinal structure (Curavacas and Lechada synclines); they are easily distinguished from other deformation events. In the structurally uppermost level we find 'flap folds'. Flap folds are recumbent structures with the invert...