United States Geological Survey YearbookThe Survey, 1987 - Forest reserves |
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Page 2
... Figure 1. Generalized geologic map of the Great Lakes region showing location of seismic re- flection profiles in the lakes and location of stations where seismic refraction data were re- corded on land and on the lake bottom . Surveys ...
... Figure 1. Generalized geologic map of the Great Lakes region showing location of seismic re- flection profiles in the lakes and location of stations where seismic refraction data were re- corded on land and on the lake bottom . Surveys ...
Page 3
Geological Survey (U.S.). A FRE Figure 2. A , Seismic " streamer " cable being deployed behind survey ship . The almost 2 - mile- long cable contains a series of hydrophones , which record echoes of acoustic waves re- flected from the ...
Geological Survey (U.S.). A FRE Figure 2. A , Seismic " streamer " cable being deployed behind survey ship . The almost 2 - mile- long cable contains a series of hydrophones , which record echoes of acoustic waves re- flected from the ...
Page 7
... Figure 5. Generalized sequence of events that formed the Mid - Continent Rift as it ap- pears on line F. A , About 1.1 billion years ago , Archean rocks of the Superior Province , about 2.6 billion years old , began to pull apart ...
... Figure 5. Generalized sequence of events that formed the Mid - Continent Rift as it ap- pears on line F. A , About 1.1 billion years ago , Archean rocks of the Superior Province , about 2.6 billion years old , began to pull apart ...
Page 8
... Figure 2. Land - use diversity in Connecticut . A. Ground water accounts for 12 percent ( 144 million gallons per day ) ... Figure 1. Population distribution Stamford in Connecticut . ( Each dot repre- sents 1,000 people . ) Bridgeport ...
... Figure 2. Land - use diversity in Connecticut . A. Ground water accounts for 12 percent ( 144 million gallons per day ) ... Figure 1. Population distribution Stamford in Connecticut . ( Each dot repre- sents 1,000 people . ) Bridgeport ...
Page 9
... Figure 2B . The Connecticut Val- ley Lowland contains some of the best agricultural land in New England . This scene of to- bacco land ( foreground ) is rap- idly disappearing in the face of urban development . Steep ba- salt ridges ...
... Figure 2B . The Connecticut Val- ley Lowland contains some of the best agricultural land in New England . This scene of to- bacco land ( foreground ) is rap- idly disappearing in the face of urban development . Steep ba- salt ridges ...
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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