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Page 5422, results 135526 - 135550

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Hydrogeologic reconnaissance of the Republican River basin, Nebraska
Michael J. Ellis
1981, Open-File Report 81-531
Information resulting from a hydrogeologic reconnaissance of the 9,710 mi2 area of the Republican River basin in Nebraska is summarized in this report on three maps as followed.Sheet 1. Configuration of Cretaceous bedrock surface.Sheet 2. Configuration of water table, spring 1977.Sheet 3. Areas of significant water-level rises and declines as of...
Composition of tidal flat sediments, Willapa Bay, Washington
Gary W. Hill, John L. Chinn
1981, Open-File Report 81-272
The purpose of this study was to characterize the modern sediments of sandy tidal flats in Willapa Bay, Washington based on their composition.Generally, clay comprises less than five percent of the sediment. Clay content increases upslope and up-estuary. Principal clay minerals are montmorillanite, illite, and chlorite; two clay mineral suites...
Geologic map of the Troublesome Roadless Area, McCreary County, Kentucky
W. R. Sigleo, A. H. Randall
1981, Miscellaneous Field Studies Map 1341-A
The Troublesome Roadless Area is composed of six tracts of land and contains 2,943 acres (fig. 1). The largest tract of the study area, located 13 mi southwest of Stearns, Ky., is accessible from that town via State Route 92 to Hill Top, and . then southwestwatd along country roads....
Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California
E. H. Pampeyan, Philip W. Harsh, J.M. Coakley
1981, Miscellaneous Field Studies Map 1217
The southernmost 15 km of this map is a product of a study that began in 1975 as part of a study of recency of faulting in coastal California (Ziony and others, 1974; Buchanan-Banks and others, 1978; Pampeyan , 1979). In February 1975, after being shown evidence of recent faulting...
Seismicity map of the state of North Dakota
B.G. Reagor, C. W. Stover, S. T. Algermissen
1981, Miscellaneous Field Studies Map 1326
The earthquake data shown on this map and listed in table 1 are a list of earthquakes that were originally used in preparing the Seismic Risk Studies in the United States in the United States (Algermissen, 1969) which have been recompiled and updated through 1977.  These data have been reexamined...
Map showing paleontological control of Paleozoic stratigraphy in New England
Marland P. Billings, Peter T. Lyttle
1981, Miscellaneous Field Studies Map 1302
Assignment of Phanerozoic stratigraphic units to their proper place in the geologica time scale is based primarily on paleontology.  Radiometric methods are becoming increasingly important (Naylor, 1976), particularly where paleontological data are lacking.  This map and text are concerned only with the paleontological data bearing on the Paleozoic stratigraphy of...
Peak horizontal acceleration and velocity from strong motion records including records from the 1979 Imperial Valley, California, earthquake
William B. Joyner, David M. Boore, Ronald L. Porcella
1981, Open-File Report 81-365
We have taken advantage of the recent increase in strong-motion data at close distances to derive new attenuation relations for peak horizontal acceleration and velocity. Acceleration data from 183 recordings of 24 earthquakes and velocity data from 62 recordings of 10 earthquakes have been used. This new analysis uses a...