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Page 4375, results 109351 - 109375

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Stratigraphy and correlation of the glacial deposits on the Montana Plains
D. S. Fullerton, R. B. Colton
1986, Quaternary Science Reviews (5) 69-82
Till units representing at least three pre-Illinoian continental glaciations, at least one Illinoian glaciation, and a late Wisconsin glaciation have been identified on the Montana Plains. Early Wisconsin or middle Wisconsin till units have not been identified. The southernmost limit of late Wisconsin glaciation is in Montana, more than 170...
Determination of ammonium in a buddingtonite sample by ion-chromatography
P.R. Klock, P. J. Lamothe
1986, Talanta (33) 495-498
An ion-chromatographic method for the direct determination of ammonium, potassium, and sodium in geologic materials is described. Samples are decomposed with a mixture of hydrofluoric and hydrochloric acids in a sealed polycarbonate bottle heated in a microwave oven. The ion-chromatograph separates the cations and determines them by conductivity measurement. The...
An analytical scheme for determining forms of sulphur in oil shales and associated rocks
M. L. Tuttle, M. B. Goldhaber, D.L. Williamson
1986, Talanta (33) 953-961
An analytical scheme for determining various forms of sulphur in oil shales and associated rocks is presented. Acid-soluble sulphate, sulphur contained in monosulphide and in disulphide minerals, and organically-bound sulphur are all quantitatively recovered as separate fractions. Finely-ground oil-shale samples are treated in an inert atmosphere with 6M hydrochloric acid to...
Separation and preconcentration of the rare-earth elements and yttrium from geological materials by ion-exchange and sequential acid elution
J.G. Crock, F.E. Lichte, G. O. Riddle, C.L. Beech
1986, Talanta (33) 601-606
The abundance of rare-earth elements (REE) and yttrium in geological materials is generally low, and most samples contain elements that interfere in the determination of the REE and Y, so a separation and/or preconcentration step is often necessary. This is often achieved by ion-exchange chromatography with either nitric or hydrochloric...
The Outer Banks of North Carolina
Robert Dolan, Harry F. Lins
1986, Professional Paper 1177-B
Understanding the natural dynamics of barrier islands in the key to recognizing and estimation both the short-term and the long-term hazards of living on them. This report summarizes how the barrier islands were created, how they have changed, and why they will continue to change in spite of efforts to...
National water summary 1985: Hydrologic events and surface-water resources
United States Geological Survey
1986, Water Supply Paper 2300
The surface-water resources of the United States, the focal point for this National Water Summary, are extensively developed and managed to provide water supplies, hydroelectric power, navigation, recreational opportunities, and sufficient instream flows to maintain fish and wildlife habitats and adequate water quality. Surface water represents 77 percent of the...