In 1970, John Ramsay and Rod Graham published a paper about shear zones1. I cited their foundational work of these structures, essentially "ductile faults," in my M.S. thesis, despite the fact that the Ramsay & Graham example shear zones were in otherwise homogenous plutonic rocks, and were a few centimeters wide. In contrast, my study area was the Sierra Crest Shear Zone System, a broad ribbon of deformation several kilometers wide and 100+ kilometers long, and deforming dozens of different lithologic units.
Categories: GEODE; gigapan; m.a.g.i.c.; scotland; shear zones; structure; featured;