The American Journal of Science, Band 4;Band 204

ammonites appears aragonite atoms bands barium basal length Basin beds biotite calcite canine cent character chloride clays colloidal color composition compound cone cone-in-cone Conrad crystalline crystals deposits described determined Devonian diameter dikes Dinictis Eocene evidence fanglomerates fault fauna feet feldspar formation fossils gabbro genera genus Geological Glass gneiss gomphodus granite graptolites Holotype Hyrachyus igneous indices John Day JOUR lake Laue photographs layers leucite limestone liquid lower Marsh mass material measurements melting metasilicate method miles minerals Miocene molar Nimravus Nimravus debilis occur orthoclase oxide Payette phase plane platycopis Pogonodon Pogonodon davisi posterior premolars probably quartz quartzite Reagan refraction region ridge rocks salt sandstone SCI.-FIFTH SERIES sediments serrulidens shales silicates Silurian skull solution space groups sparagmite specimen SrO.SiO2 strontium structure surface symmetry temperature thickness tion Triassic U. S. Geol upper zone