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Abo sandstone andesite anticlinal dome anticline axis basalt basin beds Boston Hill Bulletin calcite carbonate cent manganese Cerrillos Chupadera formation coal color contain Cooks Peak copper Cretaceous Dakota sandstone depth east erosion extends fault feet Fierro fissure ganese gold grade gravel gypsum homocline igneous rocks intrusions iron and manganese Kirchman Lake Valley limestone manganese deposits manganese oxides manganiferous calcite manganiferous iron Manzano mesa Mexico mica miles mining district occur oil and gas open cut outcrops Pinos Altos places pre-Cambrian production psilomelane Puertecito district Puertecito formation pyrolusite quartzites range rhyolite Rincon Rio Arriba County sample sand Sandia formation Santa Fe Santa Fe County Santa Rita School of Mines sedimentary rocks shaft shales Sierra silica Silver City Socorro County Socorro Mountain southwest spiegeleisen springs stone strata structure sulphide surface thickness tion tons turquoise U. S. Geol vein vicinity Water Canyon zinc zone