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165626 results.

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Page 6230, results 155726 - 155750

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Publication Extents

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Reconnaissance for uranium in asphalt-bearing rocks in the western states
William James Hail Jr.
1955, Trace Elements Investigations 559
An appraisal of asphalt-bearing rocks as potential sources of uranium was made during 1953 and 1954 by examining deposits in 45 areas in California, Utah, Wyoming, Montana, New Mexico, Texas, Oklahoma, and Missouri.  A total of 202 samples from these areas was analyzed for uranium. The oldest rocks sampled are...
The thoron-tartaric acid systems for the spectrophotometric determination of thorium
F. S. Grimaldi, Mary H. Fletcher
1955, Trace Elements Investigations 571
Thoron is popularly used for the spectrophotometric determination of thorium.  An undesirable feature of its use is the high sensitivity of the reagent toward zirconium. This study describes the use of tartaric acid as a masking reagent for zirconium. Three tartaric acid-thoron systems, developed for the determination of thorium, differ...
Stratigraphy of the area between Hernando and Hardee counties, Florida
Keith B. Ketner, Laurence J. McGreevy
1955, Trace Elements Investigations 524
Eocene, Oligocene, Miocene, and Recent rocks are exposed between Hernando and Hardee Counties. Eocene and Oligocene formations are fossiliferous limestones but Miocene rocks are largely unconsolidated sands and clays in which fossils are scarce. Correlation of Miocene strata therefore is necessarily based mainly on lithology and stratigraphic position. Where rocks are altered...
Some physical properties of naturally irradiated fluorite
Robert Berman
1955, Trace Elements Investigations 569
Five samples of purple fluorite found in association with radioactive, materials, and a synthetic colorless control sample were studied and compared.  Before and after heating, observations were made on specific gravity, index of refraction, unit-cell size, breadth of X-ray diffraction lines, and fluorescence.  The purple samples became colorless on heating...
Conglomeratic sandstone strata at the base of the Brushy Basin member of the Morrison formation as related to uranium-vanadium deposits, southwestern Colorado and southeastern Utah
David A. Phoenix
1955, Trace Elements Investigations 565
In southwestern Colorado and southeastern Utah strata of conglomeratic sandstone are localized at the base of the Brush Basin shale member of the Morrison formation of Jurassic age. These strata are discrete lithologic units that contain sedimentary structures oriented in a prevailing easterly direction, they locally rest upon sandstone in...