Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página xi
... DEPOSITS , " 9 121 · 130 131 136 Preliminary Surveys . Sinking or Shafting . Winning the Stratum - Modes of . Obstacles and Obstructions to be overcome . 3. MINING IN VEINS , 145 Searching or Prospecting the Country . Working or Winning ...
... DEPOSITS , " 9 121 · 130 131 136 Preliminary Surveys . Sinking or Shafting . Winning the Stratum - Modes of . Obstacles and Obstructions to be overcome . 3. MINING IN VEINS , 145 Searching or Prospecting the Country . Working or Winning ...
Página 20
... deposits from calcareous waters , and appear as porous , incrusting , stalactitic , and stalagmitic masses . Marl is a loose application for all friable compounds of lime and clay . The marls of fresh - water lakes are spoken of as clay ...
... deposits from calcareous waters , and appear as porous , incrusting , stalactitic , and stalagmitic masses . Marl is a loose application for all friable compounds of lime and clay . The marls of fresh - water lakes are spoken of as clay ...
Página 21
... deposits or salinas are often of considerable thickness and extent . Alum ( sulphate of alumina and potash ) , though chiefly extracted for commercial purposes from certain shales and schists , is also found in nature in the saline or ...
... deposits or salinas are often of considerable thickness and extent . Alum ( sulphate of alumina and potash ) , though chiefly extracted for commercial purposes from certain shales and schists , is also found in nature in the saline or ...
Página 23
... deposits . II . CHRONOLOGICAL ARRANGEMENT OF ROCK - FORMATIONS . ― It is not enough , however , to determine merely the posi- tions , structure , texture , and composition of rocks ; the geo- logist must endeavour to ascertain their ...
... deposits . II . CHRONOLOGICAL ARRANGEMENT OF ROCK - FORMATIONS . ― It is not enough , however , to determine merely the posi- tions , structure , texture , and composition of rocks ; the geo- logist must endeavour to ascertain their ...
Página 25
... deposits , there occur over the northern hemisphere ( down to the 40th parallel of latitude or thereby ) thick accumulations of clay and gravel , imbedding huge water - worn blocks or boulders ; and as these seem to point to a time when ...
... deposits , there occur over the northern hemisphere ( down to the 40th parallel of latitude or thereby ) thick accumulations of clay and gravel , imbedding huge water - worn blocks or boulders ; and as these seem to point to a time when ...
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Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Palavras e frases frequentes
abundant admixture agricultural alumina amount antimony arsenic artificial arts and manufactures basalts beds bismuth bituminous blocks borax Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay coal colour compact composition consists containing copper crust crystalline crystals deposits Derbyshire districts durable earth employed engineer extensively felspar fire-clay formations gems geologist Geology gold granites greenstones grits gypsum hard heat hence hydraulic ingredients iron ironstones known lignites lime limestones lustre magnesia manganese manures marbles masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat pigments polishing porphyries potash preparation purposes pyrites quarries quartz require rocks saline salts sand sandstones schists serpentines shales silica Silurian silver soda sodium soft soils specific gravity springs stones strata stratified structure substances sulphate sulphide sulphuric acid surface tertiary texture thickness tints tion tons usually varieties various vary veins volcanic yellow yield zinc