Post-depositional quicksand structures are described from the Jotnian sandstone of the Nordingrå region, Västernorrland County, where they are developed as point-up structures and sandstone dikes. Disturbance by an earthquake shock wave, uneven compaction of the material, current turbulence and overloading are possible factors which could form these quicksand structures. Earth movements and overloading are the probable causes for the structures in the Jotnian sandstone. The sandstone is essentially an arkose and subarkose with some siltstone and shale.