Fig. 4 Irish Bend x-ray diffraction patterns: (a) sample from Jackson-Frazier Site 48 at 180 cm (upper pattern) compared with a sample from the Irish Bend type section at Irish Bend, OR (lower pattern), (b) sample from the Irish Bend type section at Irish Bend, Oregon (upper pattern), compared with a sample from the Calapooyia river near Turner, OR (lower pattern). 1 = Mg-dismectite-glycol, 2 = di-vermiculite, 3 = illite, 5 = Mg-chlorite, 6 = kaolinite, 7 = albite

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