DEFORMATION BAND:
Deformation bands are planar shear zones that accommodate fault offset in porous sandstones. They form by porosity collapse and cataclasis of sand grains, resulting in low porosity and permeability across the shear zone. Deformation bands form pervasively throughout deformed sandstone bodies and vary in thickness from 1mm to tens of meters, so they can present significant barriers to fluid flow.
	This deformation band is crosscut by joints.