United States Geological Survey YearbookThe Survey, 1987 - Geology |
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Page i
... Rocks Tertiary - Cretaceous Intrusive and Volcanic Rocks Undifferentiated Cretaceous - Jurassic Sedimentary Rocks Cretaceous Augen Gneiss Permian - Devonian Sedimentary Rocks Cambrian Sedimentary Rocks Cambrian - Proterozoic Rocks ...
... Rocks Tertiary - Cretaceous Intrusive and Volcanic Rocks Undifferentiated Cretaceous - Jurassic Sedimentary Rocks Cretaceous Augen Gneiss Permian - Devonian Sedimentary Rocks Cambrian Sedimentary Rocks Cambrian - Proterozoic Rocks ...
Page 2
... rocks EARLY PROTEROZOIC ( 2500-1600 m.y. ago ) Southern Province ARCHEAN ( before 2500 m.y. ago ) Superior Province ... rock bodies that have contrasting acoustic properties , and these " echoes " are recorded on a series of hydrophones ...
... rocks EARLY PROTEROZOIC ( 2500-1600 m.y. ago ) Southern Province ARCHEAN ( before 2500 m.y. ago ) Superior Province ... rock bodies that have contrasting acoustic properties , and these " echoes " are recorded on a series of hydrophones ...
Page 3
... rock layers in the sub- surface and transmit the signals to recording equipment onboard . B , The seismic- reflection surveying system in operation on Lake Superior . Air guns in four arrays marked by the orange floats are towed be ...
... rock layers in the sub- surface and transmit the signals to recording equipment onboard . B , The seismic- reflection surveying system in operation on Lake Superior . Air guns in four arrays marked by the orange floats are towed be ...
Page 4
... rocks in the subsurface , is colored so that areas of strong- est attraction are shown in warm colors and areas of pro- gressively lower attraction are shown by progressively cooler colors ( see explanation on fac- ing page ; in ...
... rocks in the subsurface , is colored so that areas of strong- est attraction are shown in warm colors and areas of pro- gressively lower attraction are shown by progressively cooler colors ( see explanation on fac- ing page ; in ...
Page 5
... rock units were detected to depths as great as 18 miles . Projection of these rock units onto land shows that they are volcanic flows of basalt alternating with layers of sedimentary rocks . Study of these units on land indi- cates they ...
... rock units were detected to depths as great as 18 miles . Projection of these rock units onto land shows that they are volcanic flows of basalt alternating with layers of sedimentary rocks . Study of these units on land indi- cates they ...
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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