Fig. 3 X-ray diffraction patterns from <2-µm, Mg-glycol treated clay at 50-, 100-, and 180-cm depths at auger sample Sites 109, 129, 48, and 85. 1 = Mg dismectite-glycol, 2 = di-vermiculite, 3 = illite, 4 = dehydrated halloysite, 5 = Mg-chlorite, 6 = kaolinite