Search Results - "Bohor, B. F."

Mineralogic Evidence for an Impact Event at the Cretaceous-Tertiary Boundary by Bohor, B. F., Foord, E. E., Modreski, P. J., Triplehorn, D. M.

“…A thin claystone layer found in nonmarine rocks at the palynological Cretaceous-Tertiary boundary in eastern Montana contains an anomalously high value of…”
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Trace element geochemistry of altered volcanic ash layers (tonsteins) in Late Permian coal-bearing formations of eastern Yunnan and western Guizhou Provinces, China by Zhou, Yiping, Bohor, Bruce F., Ren, Youliang

“…Trace element compositions were determined (by instrumental neutron activation analysis; INAA) in 30 samples of synsedimentary volcanic ash-derived tonsteins…”
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Accretionary Lapilli in Altered Tuffs Associated with Coal Beds by B. F. Bohor, Don M. Triplehorn

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Boron in Illite as an Indicator of Paleosalinity of Illinois Coals by B. F. Bohor, H. J. Gluskoter

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Fragmentation and hydration of tektites and microtektites by GLASS, B. P., MUENOW, D. W., BOHOR, B. F., MEEKER, G. P.

“…— An examination of data collected over the last 30 years indicates that the percent of glass fragments vs. whole splash forms in the Cenozoic microtektite…”
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Scanning Electron Microscopy of Clays and Clay Minerals by Bohor, B. F., Hughes, Randall E.

“…Abstract The scanning electron microscope (SEM) proves to be ideally suited for studying the configuration, texture, and fabric of clay samples. Growth…”
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Origin and Clay-Mineral Genesis of the Cretaceous/Tertiary Boundary Unit, Western Interior of North America by Pollastro, R. M., Bohor, B. F.

“…Abstract A 3-cm-thick, two-layered clay unit that records mineralogic and textural evidence of a catastrophic event that occurred at a time now marked as the…”
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Shocked Quartz in the Cretaceous-Tertiary Boundary Clays: Evidence for a Global Distribution by Bohor, Bruce F., Modreski, Peter J., Foord, Eugene E.

“…Shocked quartz grains displaying planar features were isolated from Cretaceous-Tertiary boundary clays at five sites in Europe, a core from the north-central…”
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Interlamellar Adsorption of Carbon Dioxide by Smectites by Fripiat, J. J., Cruz, M. I., Bohor, B. F., Thomas, Josephus

“…Abstract The adsorption of CO 2 at low temperature (~ -70°C) on thin films of homoionic smectites was studied by X-ray diffraction and by i.r. absorption. An…”
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Shocked quartz grains at the Cretaceous-Tertiary boundary by SEITZ, R, BOHOR, B. F

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Goyazite in Kaolinitic Altered Tuff Beds of Cretaceous Age Near Denver, Colorado by Triplehorn, Don M., Bohor, Bruce F.

“…Abstract A hydrated alumino-phosphate mineral was identified in thin, kaolinitic clay beds of the Cretaceous Dakota Group and the overlying Mowry Shale in the…”
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Analysis of the Cretaceous-Tertiary Boundary Clay: Methodology Questioned by Bohor, Bruce F., Rampino, Michael R., Reynolds, Robert C.

“…Rampino and Reynolds' study (1983) of the clay mineralogy of Cretaceous-Tertiary boundary clays from four localities, which concludes that these boundary-clay…”
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Shocked quartz grains at the Cretaceous-Tertiary boundary: Not volcanic or atmospherically transported by Seitz, R., Bohor, B. F.

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Chemical disaggregation of kaolinitic claystones (tonsteins and flint clays) by Triplehorn, Don M, Bohor, Bruce F, Betterton, William J

“…The coarse non-clay fraction of many flint-like kaolinitic claystones often contains mineral grains diagnostic of the claystone's origin and, in the case of…”
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Distinguishing shocked from tectonically deformed quartz by the use of the SEM and chemical etching by Gratz, Andrew J., Fisler, Diana K., Bohor, Bruce F.

“…Multiple sets of crystallographically-oriented planar deformation features (PDFs) are generated by high-strain-rate shock waves at pressures of > 12 GPa in…”
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Accretionary lapilli in altered tuffs associated with coal beds; discussion and reply by Hosterman, J. W., Rice, C. L., Bohor, B. F., Triplehorn, D. M.

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Erratum to: Scanning electron microscopy of clays and clay minerals by Bohor, B. F., Hughes, R. E.

“…The author regrets that in the photograph section on p. 50 the caption to the “top” Fig. 2 should read: Fig. 2(b). Rock sample of attapulgite from Yucatan,…”
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Diatoms and tonsteins as paleoenvironmental and paleodepositional indicators in a Miocene coal bed, Costa Rica by Sanchez, J. David, Bradbury, J. Platt

“…Fresh-water diatoms are present in coal, and tonsteins (altered volcanic ash) are interbedded with the coal, in the Miocene Venado Formation on the southwest…”
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Cuban K/T catastrophe by BOHOR, BRUCE F, SEITZ, RUSSELL

“…Sir-The possibility of a Caribbean location for the asteroid or comet impact that marked the end of the Cretaceous period was first raised by Pszczolkowski1…”
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An Ancient Clay Mine at Yo’ K'at, Yucatan by Arnold, Dean E., Bohor, Bruce F.

“…This paper describes the contemporary clay mine at Hacienda Yo’ K'at, Yucatan, and documents the archaeological association of a restored sherd-tool of Puuc…”
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