United States Geological Survey YearbookThe Survey, 1987 - Forest reserves |
From inside the book
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Page 1
... major geologic features , well studied on land , project beneath the lakes , and many key areas where these major features meet or inter- sect are beneath the lakes . Geologists and geophysicists have realized for many years that the ...
... major geologic features , well studied on land , project beneath the lakes , and many key areas where these major features meet or inter- sect are beneath the lakes . Geologists and geophysicists have realized for many years that the ...
Page 2
... MAJOR GROUND - WATER FLOW SYSTEM. 42 ° The USGS and GSC jointly contracted the services of a commercial seismic sur- veying vessel that had been performing surveys off the Atlantic coast and brought it into the lakes . The ship acquired ...
... MAJOR GROUND - WATER FLOW SYSTEM. 42 ° The USGS and GSC jointly contracted the services of a commercial seismic sur- veying vessel that had been performing surveys off the Atlantic coast and brought it into the lakes . The ship acquired ...
Page 4
... major boundary be- tween the Grenville Province on the east , about 1.1 billion years old , and older provinces on the west ; major masses of intrusive granites ( shown as outlined cir- cular and elliptical features la- beled GP ) ...
... major boundary be- tween the Grenville Province on the east , about 1.1 billion years old , and older provinces on the west ; major masses of intrusive granites ( shown as outlined cir- cular and elliptical features la- beled GP ) ...
Page 5
... major continental - scale structure that curves in a broad are from Kansas through Lake Supe- rior and into southern Michigan . The rift formed about 1.1 billion years ( b.y. ) ago as the North American Continent began to break apart ...
... major continental - scale structure that curves in a broad are from Kansas through Lake Supe- rior and into southern Michigan . The rift formed about 1.1 billion years ( b.y. ) ago as the North American Continent began to break apart ...
Page 6
... major geo- logic provinces intersect beneath the lake . The Precambrian rocks are covered not only by the lake waters but also by a southwestward - thickening sheet of nearly flat - lying younger Paleozoic strata that increase in ...
... major geo- logic provinces intersect beneath the lake . The Precambrian rocks are covered not only by the lake waters but also by a southwestward - thickening sheet of nearly flat - lying younger Paleozoic strata that increase in ...
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activities Administration Alaska analysis aquifer areas Award basin Board Bureau Calcasieu River cartographic cartographic data Chief Hydrologist City City of w climate coal coastal Commission concentrations contamination cooperative Coordination County data base Denver Denver Federal Center Department of Public deposits Earth Science earthquake energy environment Environmental fiscal flow geographic information systems Geologic Division geologic map Geologist geophysical global change gram graphic ground water ground-water hazards hydrologic Hydrologist investigations Irrigation Lake Lake Nyos land located Management ment miles mineral resources National Center National Mapping Division natural Office organic Park percent Planning processes radon Regional Reston River rocks samples San Joaquin River scientific scientists sediment seismic selenium Service soils Stop streamflow studies surface tion Transportation U.S. Geological Survey United users USGS Valley Volcano Water Conservation District Water District water quality Water Resources water-quality wetlands zone