Jemez volcanic lineament (Raton hotspot trail); and the Yellowstone hotspot trail. Many volcanoes appear to be part of a lineament. It is the oldest and westernmost of the Alexandra lineament of volcanoes. A long lineament known as the Socompa Lineament is associated with the volcano. The Insubric Lineament sheared the Bregaglia batholith. The significance of this lineament and its offset is entirely unknown. Mount Pirongia and Mount Karioi are part of a lineament in the group. Blue Mountain LIneament (see below) does. A quartz-feldspar porphyry intruded the Timbs Group in the southern Arthur Lineament at . Further complicating this is a feature of unknown structure and origin, the Olympic-Wallowa Lineament (OWL). This lineament may be an area where the crust is unusually weak.