Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Don M. Triplehorn"'
Publikováno v:
Clays and Clay Minerals. 50:766-770
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 tonsteins (altered volcanic ashes), may also provide minerals suitable for radiometric dat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0cccee652ebb76861a54059ab616f4eb
https://doi.org/10.1346/000986002762090164
https://doi.org/10.1346/000986002762090164
Autor:
J. C. Hess, W. P. Nash, Don M. Triplehorn, Roger D. Congdon, William F. Outerbridge, Mirtha Capiro, Paul C. Lyons, Howard T. Evans
Publikováno v:
Geological Society of America Bulletin. 104:1515-1527
The Fire Clay tonstein is a kaolinized, airfall volcanic ash bed that was deposited in a widespread late Carboniferous peat-forming mire. Eleven samples from Kentucky and West Virginia, spanning a distance of 200 km, and two samples from Tennessee an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::553ae87443e3f1c630f5a96c4c61ff56
https://doi.org/10.1130/0016-7606(1992)104<1515:aaiakc>2.3.co
https://doi.org/10.1130/0016-7606(1992)104<1515:aaiakc>2.3.co
Publikováno v:
Organic Geochemistry. 17:567-575
Minerals derived from air-fall volcanic ash were found in two zones in the upper Paleocene Wyodak-Anderson coal bed of the Fort Union Formation in the Powder River Basin of Wyoming, and are the first reported evidence of such volcanic material in thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f64e727f8bbde3482a950a95c544d08a
https://doi.org/10.1016/0146-6380(91)90119-5
https://doi.org/10.1016/0146-6380(91)90119-5
Autor:
Don M. Triplehorn
Publikováno v:
Journal of Paleontology. 76:394-395
Many sandstones (89 of 127 tested) disaggregate in warm dimethyl sulfoxide (DMSO); no crushing is necessary and there is no known effect on minerals other than kaolinite. Fossils should be cleanly released from the sandstone matrix by gentle washing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4491bab552e6878a35581f6dd0c917cb
https://doi.org/10.1017/s0022336000041780
https://doi.org/10.1017/s0022336000041780
Publikováno v:
Journal of Geological Education. 41:260-261
Textbooks and standard geology courses commonly do not provide complete preparation for a professional geologist. Students often lack adequate perspective on the origins and interrelationships of their science as well as its broader social, political
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7104a5590ca1ce00e35af886928f101
https://doi.org/10.5408/0022-1368-41.3.260
https://doi.org/10.5408/0022-1368-41.3.260
Autor:
Don M. Triplehorn
Publikováno v:
Journal of Geological Education. 42:164-164
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb5af52a4d83b8b80d29adc6975c9b94
https://doi.org/10.5408/0022-1368-42.2.164
https://doi.org/10.5408/0022-1368-42.2.164
Autor:
Bruce F. Bohor, Don M. Triplehorn
Publikováno v:
Clays and Clay Minerals. 31:299-304
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 hogback west of Denver, Colorado. It occurs as 1-3-~m size euhedral crystals and makes up as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dcf9f775f48fc0e67922850a4e01469e
https://doi.org/10.1346/ccmn.1983.0310408
https://doi.org/10.1346/ccmn.1983.0310408
Publikováno v:
Science. 224:867-869
A thin claystone layer found in nonmarine rocks at the palynological Cretaceous-Tertiary boundary in eastern Montana contains an anomalously high value of iridium. The nonclay fraction is mostly quartz with minor feldspar, and some of these grains di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc98e2f2c5d7450d9eff967ae2886de2
https://doi.org/10.1126/science.224.4651.867
https://doi.org/10.1126/science.224.4651.867
Publikováno v:
Journal of Sedimentary Research. 55:149-151
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e35d0d0050cb4867763e1e35bcaa034
https://doi.org/10.1306/212f8648-2b24-11d7-8648000102c1865d
https://doi.org/10.1306/212f8648-2b24-11d7-8648000102c1865d