Search Results - "Bohor, Bruce F"

Carbon isotopic compositions of organic matter across continental Cretaceous–Tertiary (K–T) boundary sections: Implications for paleoenvironment after the K–T impact event by Maruoka, Teruyuki, Koeberl, Christian, Bohor, Bruce F.

“…To assess the environmental perturbation induced by the impact event that marks the Cretaceous–Tertiary (K–T) boundary, concentrations and isotopic…”
Get full text

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…”
Get full text

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…”
Get full text

Nickel-rich magnesiowiistite in Cretaceous/Tertiary boundary spherules crystallized from ultramafic, refractory silicate liquids by Kyte, Frank T., Bohor, Bruce F.

“…We have found trace inclusions of Ni-rich magnesiowastite within grains of magnesioferrite spinel recovered from Cretaceous /Tertiary boundary sediments from…”
Get full text

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…”
Get full text

Nickel-rich magnesiowuestite in Cretaceous/Tertiary boundary spherules crystallized from ultramafic, refractory silicate liquids by Kyte, Frank T, Bohor, Bruce F

“…We have found trace inclusions of Ni-rich magnesiowuestite within grains of magnesioferrite spinel recovered from Cretaceous /Tertiary boundary sediments from…”
Get full text

The first direct evidence of pre-columbian sources of palygorskite for Maya Blue by Arnold, Dean E., Bohor, Bruce F., Neff, Hector, Feinman, Gary M., Williams, Patrick Ryan, Dussubieux, Laure, Bishop, Ronald

“…Maya Blue, a nano-structured clay–organic complex of palygorskite and indigo, was used predominantly before the Spanish Conquest. It has fascinated chemists,…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text

Attapulgite and Maya Blue: An Ancient Mine Comes to Light by ARNOLD, DEAN E., BOHOR, BRUCE F.

Get full text

Origin and Clay-Mineral Genesis of the Cretaceous/Tertiary Boundary Unit, Western Interior of North America by Pollastro, R. M., Bohor, B. F.

“…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 end of the…”
Get full text

Accretionary Lapilli in Altered Tuffs Associated with Coal Beds: REPLY by Bruce F. Bohor, Don M. Triplehorn

Get full text

An Ancient Clay Mine at Yo'K'at, Yucatan by Arnold, Dean E, Bohor, Bruce F

Get full text

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

“…A hydrated alumino-phosphate mineral was identified in thin, kaolinitic clay beds of the Cretaceous Dakota Group and the overlying Mowry Shale in the Dakota…”
Get full text

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…”
Get full text

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…”
Get full text

Surface Area Measurements on Clays by Thomas, Josephus, Bohor, Bruce F., Frost, Robert F.

Get full text

Surface Area of Vermiculite with Nitrogen and Carbon Dioxide as Adsorbates by Thomas, Josephus, Bohor, Bruce F.

“…Surface-area studies were made on several homoionic vermiculites with both nitrogen and carbon dioxide as adsorbates. These studies show that only very slight…”
Get full text

Surface Area of Montmorillonite from the Dynamic Sorption of Nitrogen and Carbon Dioxide by Thomas, Josephus, Bohor, Bruce F.

“…Surface area determinations were made on a montmorillonite with various cations emplaced on the exchangeable sites, utilizing nitrogen and carbon dioxide as…”
Get full text