United States Geological Survey YearbookThe Survey, 1984 - Geology |
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Page 24
... organic matter in the formation of ore deposits , and geophysical research , such as the devel- opment of a new geophysical instru- ment , called the " Co - Axial Loop , Extra- Low - Frequency Electromagnetic Sounder . " This device can ...
... organic matter in the formation of ore deposits , and geophysical research , such as the devel- opment of a new geophysical instru- ment , called the " Co - Axial Loop , Extra- Low - Frequency Electromagnetic Sounder . " This device can ...
Page 25
... organic material , gave new clues that will help in locating concealed mineral deposits . Disseminated gold deposits recently have become the largest source of U.S. gold production and were major targets of 1984 industry exploration ...
... organic material , gave new clues that will help in locating concealed mineral deposits . Disseminated gold deposits recently have become the largest source of U.S. gold production and were major targets of 1984 industry exploration ...
Page 27
... Organic material is also a sensitive recorder of thermal events . Conodonts , the microscopic hard parts of certain marine worms ( fig . 4D ) , exhibit a systematic color change as they are heated through the temperature range of about ...
... Organic material is also a sensitive recorder of thermal events . Conodonts , the microscopic hard parts of certain marine worms ( fig . 4D ) , exhibit a systematic color change as they are heated through the temperature range of about ...
Page 28
... organic matter that is dispersed in rocks matures as a function . of time to become a glassy , coallike substance ... organic - rich dolomites and limestones or in organic - rich limey shales . The origin and many geologic ...
... organic matter that is dispersed in rocks matures as a function . of time to become a glassy , coallike substance ... organic - rich dolomites and limestones or in organic - rich limey shales . The origin and many geologic ...
Page 77
... organic matter . Their physical characteristics and the degree of coalification of the organic matter ( rank ) determine the properties , reactivity , and yield of coal . Changes in coal rank , depth of burial , and deposi- tional ...
... organic matter . Their physical characteristics and the degree of coalification of the organic matter ( rank ) determine the properties , reactivity , and yield of coal . Changes in coal rank , depth of burial , and deposi- tional ...
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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 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 National Center National Mapping Division Office offshore Parkfield Parkfield earthquake potential production quadrangle radar Regional remote sensing River rocks San Andreas fault scientific sediment Service sewage 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