Report, Band 12Johns Hopkins Press, 1928 CONTENTS.--Vol. I (1897)--Vol. II (1898)--Vol. III (1899)--Vol. IV (1902)--Vol. V (1905)--Vol. VI (1906)--Vol. VII (1908)--Vol. VIII (1909)--Vol. IX (1911)--Vol. X (1918)--Vol. XI (1922)--Vol. XII (1928)--Vol. XIII (1937)--Vol. XIV (1941) |
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Seite 20
... gneiss . Granite ..... Gabbro ..... Contact rocks .. Dikes and veins .. Petrography ..... Hypersthene gabbro ... 289 291 293 293 291 295 295 295 296 297 297 298 298 Page Meta - gabbro .. Serpentine .. 301 305 Index 20 CONTENTS.
... gneiss . Granite ..... Gabbro ..... Contact rocks .. Dikes and veins .. Petrography ..... Hypersthene gabbro ... 289 291 293 293 291 295 295 295 296 297 297 298 298 Page Meta - gabbro .. Serpentine .. 301 305 Index 20 CONTENTS.
Seite 131
... veins and pegmatite dikes is flint and it is with the occurrence , quarrying , and milling of this material that the present report deals . Flint in the mineralogic sense is a cryptocrystalline form of quartz of entirely MARYLAND ...
... veins and pegmatite dikes is flint and it is with the occurrence , quarrying , and milling of this material that the present report deals . Flint in the mineralogic sense is a cryptocrystalline form of quartz of entirely MARYLAND ...
Seite 133
... veins and dikes intersecting the country rock and as lenticular masses intercalated in schists and gneisses . In most of the deposits that have been worked the quartz occurs unmixed with other minerals . Frequently , however , it occurs ...
... veins and dikes intersecting the country rock and as lenticular masses intercalated in schists and gneisses . In most of the deposits that have been worked the quartz occurs unmixed with other minerals . Frequently , however , it occurs ...
Seite 134
... veins , and lenticular masses in which other minerals occur at most as accessory constituents . There is no sharp line of demarcation between the dikes and veins on the one hand and the lenticular intercalations . In fact all the ...
... veins , and lenticular masses in which other minerals occur at most as accessory constituents . There is no sharp line of demarcation between the dikes and veins on the one hand and the lenticular intercalations . In fact all the ...
Seite 136
... veins in the gneisses and schists . As these rocks undergo decom- position and are removed by erosion the flint remains behind and accum- ulates at the surface , generally partly buried in the soil . Such blocks , frequently weighing ...
... veins in the gneisses and schists . As these rocks undergo decom- position and are removed by erosion the flint remains behind and accum- ulates at the surface , generally partly buried in the soil . Such blocks , frequently weighing ...
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Häufige Begriffe und Wortgruppen
30 feet Albany sand altered arbitrators award Baltimore County Baltimore gneiss BOND AND PERMEABILITY boundary line buddle Cecil County chlorite chromite Clay class Clay Sub cleavage Coarseness figure color commissioners compact Company Creek crystals deposits diabase diallage Dye Adsorption figure east epi-diorite farm feet deep feet long feet wide feldspar feldspar quarries fibrous FINENESS TEST flint formation gabbro Geol gneiss grade Grain class Grain fineness granite green Harford County hauled hill hornblende hypersthene hypersthene gabbro intrusive limestone located magnetite Marriottsville Maryland and Virginia masses material metamorphism mica mica schist microscope mile southeast mill mineral molding sand northeast occurs olivine opening outcrop pegmatite Pennsylvania peridotites PERMEABILITY TESTS pits plagioclase potash Potomac River pottery production pyroxene pyroxenites quarry Plate VII quartz railroad region road rock sample sand chrome schist schistose serpentine serpentine areas shows soapstone specimens Survey talc tremolite veins Virginia and Maryland width
Beliebte Passagen
Seite 36 - And be it enacted, That this Act shall take effect from the date of its passage.
Seite 36 - That the sum of four thousand and six hundred dollars be, and the same is hereby, appropriated, to be paid out of any money in the Treasury not otherwise appropriated...
Seite 24 - The citizens of each state respectively shall have full property in the shores of Potomack river adjoining their lands, with all emoluments and advantages thereunto belonging, and the privilege of making and carrying out wharves and other improvements, so as not to obstruct or injure the navigation of the river...
Seite 273 - A light-green chloritic rock somewhat schistose. Very soft and easily crushed by the hammer. There are some dark stains between the layers. Under the microscope the rock is seen to be made up of chlorite and actinolite. Cf . 69B. There is much magnetite in crystals, in beautiful cubes and octahedrons. There is a little quartz. The chlorite is green and pleochroic in slightly pleochroic blades with cross gashes. Extinction inclined.
Seite 33 - States, the Governor of this State be, and he is hereby authorized and empowered to appoint a...
Seite 17 - Beginning at the point on the Potomac River where the line between Virginia and West Virginia strikes the said river at low-water mark, and thence following the meanderings of said river by the low-water mark to Smith's Point, at or near the mouth of the Potomac, in the latitude 37° 53' 8
Seite 17 - Survey, we have come as near) to perfect mathematical accuracy as in the nature of things is possible. But in case of any inaccuracy in the described course or length of a line or in the latitude or longitude of a place the natural objects called for must govern.
Seite 18 - Virginia is entitled not only to full dominion over the soil to low-water mark on the south shore of the Potomae, but has a right to such use of the river beyond the line of low-water mark as may be necessary to the full enjoyment of her riparian ownership...
Seite 173 - ... 2.55 The ore minerals have the same appearance in Sample IV as in the others and they are made up either of a spinel molecule in which Cr2O3 has given way almost completely to A12O3 and Fe2O3 or a mixture of a spinel in which Cr2O3 has given way to much A12O3 with considerable magnetite. The percentage of titanium also indicates a higher percentage of ilmenite. In order to get a clearer idea of the nature of the ore particles in these concentrates and particularly in the case of the two samples...