Bulletin of the United States Geological SurveyThe Survey., 1896 |
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Página 12
... strata in Louisiana was first indisputably established by Hilgard in 1869.2 Subsequently Hopkins , Johnson , and Lerch have noted the occurrence of Cretaceous in the State . Dr. Lerch gives a list of the localities of these rocks in his ...
... strata in Louisiana was first indisputably established by Hilgard in 1869.2 Subsequently Hopkins , Johnson , and Lerch have noted the occurrence of Cretaceous in the State . Dr. Lerch gives a list of the localities of these rocks in his ...
Página 13
... strata , and that the water flows from the Upper Cretaceous sands . Judging from the bores and exposures of this substructure of Louisiana , and excluding the overlying later deposits , it repre- sents a ridge with steep hillsides and ...
... strata , and that the water flows from the Upper Cretaceous sands . Judging from the bores and exposures of this substructure of Louisiana , and excluding the overlying later deposits , it repre- sents a ridge with steep hillsides and ...
Página 14
... strata of that age in the State . These beds are composed of lignitic clays and sands , the sands often cross bedded ... strata belonging to the Eocene period found in Louisiana . The following are approximately the limits of the area ...
... strata of that age in the State . These beds are composed of lignitic clays and sands , the sands often cross bedded ... strata belonging to the Eocene period found in Louisiana . The following are approximately the limits of the area ...
Página 15
... strata that I consider Lignitic . If this point is connected with the point where Mr. Harris's Lignitic - Claiborne parting , as shown on his map of southern Arkansas , reaches the Arkansas - Louisiana State line , it will be seen that ...
... strata that I consider Lignitic . If this point is connected with the point where Mr. Harris's Lignitic - Claiborne parting , as shown on his map of southern Arkansas , reaches the Arkansas - Louisiana State line , it will be seen that ...
Página 16
... strata occur throughout the whole area of the Lower Claiborne . In Bossier , Claiborne , and Bienville parishes fossils are found as casts in sandstone and as ferruginous replacements . In Webster , Bienville , and Jackson parishes the ...
... strata occur throughout the whole area of the Lower Claiborne . In Bossier , Claiborne , and Bienville parishes fossils are found as casts in sandstone and as ferruginous replacements . In Webster , Bienville , and Jackson parishes the ...
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Términos y frases comunes
acid apatite augite beds biotite bluff Bull California Cambrian Carboniferous chlorite clay balls Coal cobbles color Contains plagioclase County Creek Cretaceous deposits Describes the occurrence Devonian dike Discusses east Eocene erosion exposures feldspar figs folio fossils Geology Glacial gneiss gold granite gravel gray groundmass H₂O Harris hills hornblende Iowa iron James Jour K₂O Kansas kaolin Keyes L. G. Eakins Lake layers lignite limestone London magnetite masses material Matthew Merrill miles Miller and Gurley minerals Missouri moraine mottled Mountain Newberry olivine orthoclase Paleontology-Continued Paleozoic Paris plagioclase Pleistocene porcelain portion Potomac formation pottery pre-Cambrian Proc quartz quartzite record region Rept Rhyolite River rocks sand sandstone sandy clay Scudder Silurian SiO2 species stones strata Surv Tertiary TiO2 Trace Trans Turner U. S. Geol Ulrich Undet Valley W. F. Hillebrand Weed and Pirsson Whiteaves Whitfield Winchell and Schuchert
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Página 29 - Friedel ° indicates a means for determining the true weight of water lost by minerals behaving like the zeolites, even without collecting the water lost, namely, by driving out of the dehydrated and weighed mineral, under proper precautions, any air it may have absorbed in the process of drying and cooling, and collecting and measuring this air and thus finding its weight, which, added to the apparent loss, gives the true contents in water.
Página 22 - CRUSHING. For accurate analyses the use of steel power crushers and mortars is out of the question because of the danger of contamination by particles of metal and the impossibility of cleansing the roughened surfaces after they have been in use a short time. Extraction, by the aid of a magnet, of steel particles thus introduced into the powder is quite inadmissible, since the rocks themselves, almost without exception, contain magnetic minerals.
Página 61 - If, therefore, on evaporation of the filtrate, much iron is indicated, the gelatinization may well be due to olivine alone or in part, and then the quantitative relation of silica to iron plus magnesium should be ascertained. It must also be borne in mind that any other very soluble silicates present will be more or less affected, and that apatite is largely or wholly dissolved. It is possible that still more dilute nitric or perhaps some other acid may exert a slighter solvent action on olivine...
Página 20 - Survey was there to be found in the light of modern methods, a satisfactory exposition of the procedures to be followed or the precautions to be observed, especially in the search for some of the rarer constituents or those which, without being rare, have been of late years recognized as occurring persistently in small amounts. It was not the intention to .make the chapter on rock analysis in...
Página 28 - It had regained 1J per cent of its original weight, although the desiccator was tightly closed and the crucible covered, showing apparently a drying power superior to that of the acid. A specimen of tyrolite was found on one occasion to lose 10.34 per cent at 280°, and on another occasion 14.33 per cent.
Página 49 - ... as ZrO2. Certainty as to its identity can be had by again bringing it into solution, precipitating by ammonia, dissolving in hydrochloric acid, evaporating to a drop or two, and testing with turmeric paper or by a microchemical reaction. With the very smallest amounts no color can be obtained by this turmeric-paper test, which, however, responds readily to as little as 1 milligram of dioxide and with proper care for as small an amount as 0.3 milligram (Dr.