United States Geological Survey YearbookThe Survey, 1987 - Geology |
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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 crustal fea- tures such as the Mid - Continent Rift ( Lines C , B , A , F , G , H ) , the Grenville Front ( line J ) , and the Penokean fold belt ( lines H and I ) . Grenville Front - ) - Lake Ontario N. Y. PA . A Figure 2. A ...
... major crustal fea- tures such as the Mid - Continent Rift ( Lines C , B , A , F , G , H ) , the Grenville Front ( line J ) , and the Penokean fold belt ( lines H and I ) . Grenville Front - ) - Lake Ontario N. Y. PA . A Figure 2. A ...
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 arc 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 arc 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 agencies Alaska aquifer basin Bureau Calcasieu River cartographic CD ROM Chief City City of w coal color Commission concentrations Connecticut contamination cooperative Coordination County crater data base Department of Public deposits drilling Earth Science earthquakes energy Enewetak Environmental facilities Federal feet Figure fiscal year 1987 geographic information systems geologic map Geologist geophysical gram graphic ground water hazards hydrologic Hydrologist investigations Lake Nyos land located lower Calcasieu River major Management ment miles million mineral resources mining models National Center National Mapping Division Office organic compounds Park percent Planning processes production projects Province quadrangle Regional Reston rocks samples San Andreas fault San Joaquin River scientific scientists sedimentary sediments seismic selenium Service South Stop studies surface Survey's techniques tion topographic Transportation U.S. Geological Survey United users USGS Vernalis Volcano Water District Water Resources water-use zone