Structural geology is the scientific discipline that is concerned with crustal deformation on both a large and a small scale. Its scope of study is vast, ranging from submicroscopic lattice defects in crystals to fault structures and fold systems of the Earth’s crust. The primary goal of structural geology is to measure the deformation of the crust to uncover information about the history of deformation (strain) in the rocks, and how, when and why this strain accumulated.