Bulletin, Issue 945

50 feet adit amphibolite average beach beds beryllium beryllium-bearing black sand bodies BULLETIN 945 PLATE Bureau of Mines chlorite chromiferous sand chromite chromite deposits claim concentrates contain County diabase dikes diopside disseminated district Drill dunite east explored exposed fault feet long feet thick feet wide fine-grained FLORENCE Four Chromes fractures Gallon Jug garnet Geologic map GEOLOGICAL SURVEY grade grains granite granulite Gulch Hellroaring Plateau helvite Highline holes igneous rock indicated intrusive Iron Mountain layers lens lenses limestone Line Creek Plateau magnetite masses massive tactite metamorphic rocks miles minerals monzonite NORTH MAGNETIC NORTH occur olivine percent Cr203 peridotite porphyry quartz quartzite range recrystallized Red Lodge rhyolite ribbon rock samples San Luis Obispo saxonite scheelite sea cliff serpentine Seven Devils shale short tons silicate Silver Run Plateau Strike and dip surface tactite terrace tremolite trenches TRUE NORTH MAGNETIC tungsten