Detachments faults of this kind (initially low-angle) can be found in the Whipple Mountains of California and the Mormon Mountains of Nevada.[5] They initiate at depth in zones of intracrustal flow, where mylonitic gneisses form. Shear along the fault is ductile at mid to lower crustal depths, but brittle at shallower depths. The footwall can transport mylonitic gneisses from lower crustal levels to upper crustal levels, where they become chlorititic and brecciated.[2] The hanging wall, composed of extended, thinned and brittle crustal material, can be cut by numerous normal faults.