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Page 6391, results 159751 - 159775

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Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming
Z. E. Peterman, B. R. Doe, H.J. Prostka
1970, Contributions to Mineralogy and Petrology (27) 121-130
The Absaroka volcanic field is comprised of predominant andesitic volcaniclastic rocks and less abundant potassium-rich mafic lavas (shoshonites and absarokites). Strontium and lead isotopic variations preclude a simple derivation from an isotopically uniform source: Sr87/Sr86, 0.7042 to 0.7090; Pb206/Pb204, 16.31 to 17.30; Pb208/Pb204, 36.82 to 37.64....
The strontium isotopic composition of basalts from the Gordo and Juan de Fuca Rises, northeastern Pacific Ocean
C. E. Hedge, Z. E. Peterman
1970, Contributions to Mineralogy and Petrology (27) 114-120
The strontium isotopic compositions have been determined for twelve tholeiitic basalts dredged from the Gordo and Juan de Fuca Rises. Sr87/Sr86 ratios range from 0.7012 to 0.7031 and average 0.7026. These data, combined with other data from the East Pacific Rise indicate that tholeiite basalts being erupted...
Distribution of rubidium between sodic sanidine and natural silicic liquid
D. C. Noble, C. E. Hedge
1970, Contributions to Mineralogy and Petrology (29) 234-241
Phenocrysts of sodic sanidine from twelve upper Cenozoic units of silicic ash-flow tuff and lava from the Western United States contain from 0.25 to 0.45 the Rb present in the associated groundmass materials. The ratios of potassium to rubidium in the sanidines are, on the average,...
A note on the stomach contents of two whooping cranes
Francis M. Uhler, Louis N. Locke
1970, Condor (72) 246-246
On 4 January 1968 an adult female Whooping Crane (Grus americana) was illegally shot by a hunter near the Aransas National Wildlife Refuge, Texas. The carcass was immediately frozen and subsequently shipped to the Patuxent Wildlife Research Center for autopsy....
Organochlorine residues and autopsy data from bald eagles 1966-68
B.M. Mulhern, W. L. Reichel, L. N. Locke, T. G. Lamont, A. A. Belisle, E. Cromartie, George E. Bagley, R. M. Prouty
1970, Pesticides Monitoring Journal (4) 141-144
Sixty-nine bald eagles found moribund or dead in 25 States during 1966-68 were analyzed for pesticide residues. Residues of polychlorinated biphenyls and DDE were detected in all samples of eagle carcasses; residues of dieldrin were detected in 68 and residues of DDD in 64; DDT, heptachlor epoxide, and DCBP were...
Mass movement of black fly larvae on silken threads (Diptera: Simuliidae)
I.B. Tarshis, W. Neil
1970, Annals of the Entomological Society of America (63) 607-610
Stoppage of waterflow in a stream resulted in the migration of massive numbers of black fly larvae on silken threads. Larvae were found on single silken threads, but the heaviest concentrations were on “cables” composed of 25-50 individual silken threads. The larvae were attached in concentric rings around the silken...