Contributions to Economic Geology, 1902

Alaska amount anticline asphalt basin bed rock belt Bingham bituminous bodies breccias calcite Canyon carbonate Carboniferous Cartersville cement cent chalcocite chalcopyrite chert clay coal field contain copper country rock County Cretaceous deposits depth dikes diorite district east economic extends fault feet fissures folds formation fractures fuel fuller's earth Glenn Creek gneiss gold gossan granite gravel gypsum Hill igneous rocks important inches intrusive iron lime limestone located lower marble mass material miles Mineral Resources U. S. mining Mountain northeast occur ocher outcrops oxide phosphate pits porphyry portion present probably pyrite quadrangle quartz quartzite region Rept River salt sand sandstones schists shaft shales siliceous silver slag slate slope southeast southwest sphalerite stone strata stream structure sulphides surface thickness tion U. S. Geol upper Valley veins vicinity Yukon zinc zone