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acid akermanite alnoite analysis ant.-post apatite atoms augite beds biotite birefringence calcium canine carbonate Carex cesium cesium chloride character chemical chloride chrysolite collected collophane color columbites composition compound contains crystals cusps deposits depth described determined diameter diopside dissociation dustfall earth evidence fault fauna ferric fossil gehlenite genus Geol Geological glacial glass heat Holotype homogeneous humboldtilite hydrochloric acid indices of refraction Inhomogeneous Jour later Leidy length liquid loess lower Marsh material melilite miles mineral Miocene mixtures molar molecules monticellite Museum nearly Nebraska nephelite Niobrara River Oligocene olivine optical Ordovician original oxide percent perigynia phase pistillate plane Pliocene posterior premolars present Professor pyroxene ramus region rock sample shale skull Smilodon solid solution species specific gravity specimen spikes structure surface Table teeth temperature tion trace trails transverse triple salt tubercle Walcott
Seite 173 - wide upper valley of the Clearwater River, a most perfectly exposed series of limestones, shales, and sandstones of Upper Cambrian and later formations was found, which cleared up the relations of the upper portion of the Glacier Lake section to the Ordovician above.
Seite 32 - and biotite, which is apparently new. A study of the relations of the minerals indicates that the rock originally consisted of augite and chrysolite and was nearly completely consolidated as such. These minerals were then attacked, with lowering temperature, probably by their own interstitial liquid as it changed in composition, and were replaced by monticellite,
Seite 33 - melilites so formed are analogous to natural melilites in composition and optical properties. It is thus proved experimentally that nephelite reacts with diopside to form melilite, a reaction analogous to that which is considered to have taken place between augite and alkalic liquid in the natural rocks. This reaction is of the nature of a
Seite 32 - and biotite with marialite, perovskite and titaniferous magnetite as minor products of the reaction. The monticellite is itself replaced by melilite and biotite and the melilite-biotite rock is the end product of the replacement. The replacement was accomplished by an alkalic liquid (magma) which formed monticellite from augite by desilicating it and later gave rise to melilite and the more definitely
Seite 173 - north of Lake Louise, a geological section was studied that tied in the base of the Glacier Lake section of 1919 with the Middle and Lower Cambrian
Seite 422 - under the joint auspices of the Carnegie Institution of Washington and the National Academy of Sciences,