High Quality Content by WIKIPEDIA articles! The Brothers Fault Zone (BFZ) — believed to have been named after Brothers, Oregon — is the most notable of a set of northwest trending fault zones including the Eugene—Denio, McLouglin, and Vale zones that dominate the geological structure of most of Oregon. These are also representative of a regional pattern of generally northwest striking geological features ranging from Walker Lane on the California—Nevada border to the Olympic-Wallowa Lineament in Washington; these are generally associated with the regional extension and faulting of the Basin and Range Province, of which the BFZ is considered the northern boundary.