Bulletin, Izdaje 68–71

alluvium artesian aquifer Broadus bed Canyon Carbonaceous shale Cascade County chlorite Clark County claystone coal bed common brick Cook bed Cretaceous deposits depth diameter 6 inches dk red HS dolomite Drilled observation water-table drying and firing feet above lad firing character firing characteristics firing properties firing shrinkage Flathead Lake Geologic description gravel ground-water Helena Highest water level July June June 20 Kalispell kaolinite Lewis & Clark Lewis and Clark Location lt red SS maj maj maj tr material mile Mines and Geology Montana Montana Bureau montmorillonite Morrison Formation MP top mudstone Pawnee bed Perched dune plasticity is low Powder River County quartz Quaternary alluvium R. B. Berg Cascade R. B. Berg Lewis Records available Road cut Sample sandstone Sept siderite silty Survey Bull Tertiary sediment Test results Tongue River U. S. Geol unsuitable for ceramic