Example of a sheath fold developed in Moine psammites. This fold has a test-tube like shape in 3D, visible in the outcrop. An intense stretching lineation plunges parallel to the length of the "tube" - the main hinge line of the sheath fold. Folds like this are thought to require very high values of simple shear in order to form.

To see how these form, click here.

Return to gallery

Learning structure home page