Bulletin, 132. izdajaMontana College of Mineral Science and Technology, 2001 |
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134 deposit 7½-minute 72-minute quadrangle Anaconda analcime Arrow Creek Bed Beaver Creek Beaver Creek area Beaverhead County Belt Butte bentonite bentonite bed bentonitic mudstone biotite Blackleaf Formation Blacktail Deer Creek Bondar-Clegg calcite Canyon Ferry cation exchange capacity centimeters clino clinoptilolite concentrations consists mainly contour interval 40 Creek Location Cretaceous cristobalite east evidence of zeolitization Exposure of zeolitized feldspar Geology Grasshopper Creek deposits Hepburn's Mesa interval 40 ft lapilli major constituent Medicine Lodge Creek mile 1 kilometer Mineralogy minerals mordenite Muddy Creek basin mudstone natural zeolites NE¼ opal-CT percent poorly exposed quartz Ramsay recognized rhyolite road Salt Creek Sample Number Scanning electron micrograph SE¼ section sedimentary rocks smectite southwest of Dillon specimens Tabor Mountain thick tuff of Grasshopper tuffaceous beds Vaughn volcanic rocks volcaniclastic West Fork x-ray diffraction X-ray diffraction trace zeolite deposits Zeolite occurrence zeolitic alteration Zeolitic sample zeolitized beds zeolitized rock zeolitized tuff