United States Geological Survey YearbookThe Survey, 1985 - Geology |
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Page 21
... district , an area which contains the largest lead reserves in the world ( fig . 2 ) . The important mineral deposits of this major district occur in geologic formations that extend beneath the surface for hun- dreds of miles to the ...
... district , an area which contains the largest lead reserves in the world ( fig . 2 ) . The important mineral deposits of this major district occur in geologic formations that extend beneath the surface for hun- dreds of miles to the ...
Page 22
... district . By “ mapping ” relative metal abundances as well as other relationships of the introduced metal suite and correlating this information with certain character- istics of the subsurface stratigraphy , the scientists discovered ...
... district . By “ mapping ” relative metal abundances as well as other relationships of the introduced metal suite and correlating this information with certain character- istics of the subsurface stratigraphy , the scientists discovered ...
Page 24
... district , or region . The master file now contains over 64,000 records of mineral deposits and occurrences in the United States and more than 5,300 records for other countries . As the need for rapid access to comprehensive mineral ...
... district , or region . The master file now contains over 64,000 records of mineral deposits and occurrences in the United States and more than 5,300 records for other countries . As the need for rapid access to comprehensive mineral ...
Page 26
... district , southern Illinois , showing lighter ( light - brown color ) and heavier ( oval black globules ) petroleum fractions and a methane vapor bubble ( dark circular feature ) . C , Fission tracks in a uranium - bearing apatite ...
... district , southern Illinois , showing lighter ( light - brown color ) and heavier ( oval black globules ) petroleum fractions and a methane vapor bubble ( dark circular feature ) . C , Fission tracks in a uranium - bearing apatite ...
Page 30
... district of northern Idaho were formed from metamorphic fluids produced during late Precambrian metamor- phism of rocks of the Belt Super- group . The fluids leached the metals from the typical Belt rocks and deposited them in fractures ...
... district of northern Idaho were formed from metamorphic fluids produced during late Precambrian metamor- phism of rocks of the Belt Super- group . The fluids leached the metals from the typical Belt rocks and deposited them in fractures ...
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activities Alaska aquifer areas Assistant Bacillus cereus basins Bureau California cartographic cartographic data base City coal Columbia Glacier Commission contaminants Control Cooperative Denver Department of Public digital cartographic data digital data earthquake energy Environmental eruption Federal agencies Federal Bldg feet fiscal year 1984 flow fluid inclusions geochemical geographic geographic information systems Geologist geophysical ground water ground-water hazards High Plains hydrologic ical image map information systems investigations irrigation Lake land Landsat lava located Loki Patera major Management Mauna Loa million mineral deposits mineral resources models monitoring National Center National Mapping Division Office offshore Parkfield Parkfield earthquake Planning potential production quadrangle radar Regional remote sensing River rocks San Andreas fault scientific sediment Service sources square miles STOP studies sulfur surface Survey scientists Survey's techniques tion topographic maps trends U.S. Geological Survey Volcano Water Conservation District Water District zone