Bulletin, Issue 940

20 feet anomaly anorthosite anticline Antietam quartzite argillite Aroostook Becraft sandstone beds Blue Ridge body Boriana brecciated Bureau of Mines carbonate carloads chert Clinton formation cobalt contain County depth dikes dolomite drill holes Dudley farm east exposed fault Flat Top Mountain folds fractures gabbro ganese Geol Geological Survey grade granite gravel hematitic hematitic shale Hill Houlton area Johnson Creek layers limestone localities long tons Lyndhurst magnetic concentrate magnetite magnetite-ilmenite main pit manga manganese deposits manganese oxides manganiferous iron manganiferous rocks masses miles minerals Mount Torry nese nodules northeast northwest Number occur Ochoco open cut outcrops Paint Bank percent manganese phyllite plate pocket probably prospect pits psilomelane pyrolusite quartz quartzite residual clay Rose Creek Round Mountain samples sandstone scheelite shaft shale silicate southeast southwest Stose strike structure surface syncline terrace deposits tons tract trenches trend tungsten tunnel valley vanadium veins Virginia