Tinted detail of a photo: Aerial view of steep limestone mountain ridges whose pale rock layers are tilted almost vertical, with green grassy slopes between them, a deep shadowed valley and a building with a mast on the left summit.
TS
Tectonics and Structural Geology

sheath fold

Features from the Field: Sheath Folds

Features from the Field: Sheath Folds

Shear zones are areas of intense deformation that localize the movement of one block of the crust with respect to another. In previous posts, we have seen that shear zones contain some very deformed rocks called mylonites, lineations that tell us the direction of movement, and useful kinematic indicators, such as S-C fabrics, that allow …[Read More]