Report on the United States and Mexican Boundary Survey: Made Under the Direction of the Secretary of the Interior, 1권,파트 2C. Wendell, printer, 1857 |
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9 페이지
... thickness of the formation in the regular succession of the uplifted strata , as thus exposed , from summit to base ; there is developed at several points a thickness of not less than 1,500 feet . No very marked change is observable in ...
... thickness of the formation in the regular succession of the uplifted strata , as thus exposed , from summit to base ; there is developed at several points a thickness of not less than 1,500 feet . No very marked change is observable in ...
12 페이지
... thickness and richness in this lower forma- tion . The veins of mineral penetrate this rock in the form of variable sheets , dipping regularly at an angle of 45 ° to the northwest . Further details in reference to the character and ...
... thickness and richness in this lower forma- tion . The veins of mineral penetrate this rock in the form of variable sheets , dipping regularly at an angle of 45 ° to the northwest . Further details in reference to the character and ...
13 페이지
... thick underground stems . These being grubbed up by a class of peon laborers , are disposed in piles to dry , when they become fit for conversion into a superior article of charcoal . " " At a distance of 20 miles over the above ...
... thick underground stems . These being grubbed up by a class of peon laborers , are disposed in piles to dry , when they become fit for conversion into a superior article of charcoal . " " At a distance of 20 miles over the above ...
22 페이지
... thickness , from one to twelve inches ; the character of the ore and its specific gravity also varied at different points . ( See description and analysis by Professor T. Antisell . ) - The mode of extracting the silver is by a double ...
... thickness , from one to twelve inches ; the character of the ore and its specific gravity also varied at different points . ( See description and analysis by Professor T. Antisell . ) - The mode of extracting the silver is by a double ...
25 페이지
... thickness . It yielded 73. 75 per cent . of lead . The mean of two accordant assays , by cupellation , gave 0. 365 per cent . of silver . The copper in both this and the following specimen is so unequally disseminated , that it was ...
... thickness . It yielded 73. 75 per cent . of lead . The mean of two accordant assays , by cupellation , gave 0. 365 per cent . of silver . The copper in both this and the following specimen is so unequally disseminated , that it was ...
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adjoining alluvial Ammonites basin beds belt bluffs Boundary Survey breccia calcareous cañon Caprina carbonate carboniferous limestone character clay coal measures coast collections color Colorado compact composed connexion containing copper Cordilleras course creek cretaceous cretaceous formation cretaceous fossils cretaceous strata crystalline deposits desert diluvial Eagle Pass El Paso elevation exhibit Exogyra exposures extensive feet feldspar feldspathic fossils Frémont frequently geological granite gravelly table-land green sand igneous rocks Inoceramus irregular Jersey lava lignite localities lower valve marked marl mass metamorphic rocks miles mineral Missouri mountain range mouth Nebraska numerous occur Ostrea Paso Pitcheri plain PLATE porphyritic portion present problematicus quartz region ribs ridge Rio Bravo river rocky Roemer San Pedro sandstone Santa shell side Sierra similar slope Sonoyta southwest species specimens springs strata stratified stream summit surface Tertiary formation TEXANA Texas texture thick umbo upper valley various vicinity volcanic