Bulletin - United States Geological Survey, Issue 209

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Page 125 - LIBRARY CATALOGUE SLIPS. [Take this leaf out and paste the separated titles upon three of your catalogue cards. The first and second titles need no addition: over the third write that subject under which you would place the book in your library.] United States.
Page 124 - Price 10 cents. 65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by Israel C. White. 1891. 8". 212pp. 11 pi. Price 20 cents. 66. On a Group of Volcanic Rocks from the Tewan Mountains, New Mexico, and on the occurrence of Primary Quartz in certain Basalts, by Joseph Paxson Iddings.
Page 124 - Rocks, by Whitman Cross, with, a Geological Sketch of Buffalo Peaks, Colorado, by SF Emmons. 1883. 8. 42pp. 2 pi. Price 10 cents. 2. Gold and Silver Conversion Tables, giving the coining value of troy ounces of fine metal, etc..
Page 49 - After the publication of the classification set forth in the paper of 1886 " a large number of investigations were undertaken, not only in New York, but in other parts of the country, which throw new light upon the questions then raised. But nowhere have the statistics been so well gathered as in New York State. Particularly valuable have been the researches of Prof.
Page 123 - The Professional Papers, Bulletins, and Water-Supply Papers treat of a variety of subjects, and the total number issued is large. They have therefore been classified •into the following series: A, Economic geology...
Page 104 - ... of the bottom. If in such case each fauna is kept distinct, the means of tracing the geographic distribution and modification are at hand. If mingled, then the collection, though made at the same locality, will only confuse. Two such faunas meet at Owego, Tioga county, in distinct strata, but in rocks which are of similar lithologic character; one is a remnant of a prevailing western fauna, the other is an eastern and late stage of a new fauna. Fifth. The classification of the rocks may receive...
Page 149 - Price 5 cents. 34. On the Relation of the Laramie Molluscan Fauna to that of the Succeeding Fresh- Water Eocene and Other Groups, by Charles A. White.
Page 51 - The microperthite is especially interesting on account of its typical development. The usual intergrowth is that of orthoclase with a plagioclase varying from albite to an acid oligoclase near Ab5An,, but on many cleavage pieces it was easily proved that the triclinic feldspar was intergrown with a monoclinic, itself strongly charged with the soda molecule. Such individuals gave extinctions of 12 and 19 on (010) for the two kinds of...
Page 9 - ... at the base of the hill), is strictly controlled in form by a small elliptical stock of alkaline syenite cutting the softer diorites. Apart from other more general considerations, the fact that these eruptive rocks are more resistant to weather than the surrounding schists is clear from the nature of the slopes and profiles at the contacts. As a rule there is an abrupt steepening of the ascent along the radiating spurs of the main mountain just above the contact between the sedimentary and eruptive...
Page 135 - New or rare species of fossils from the horizons of the Livonia salt shaft [New York].

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