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
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