Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Roger D. Congdon"'
Autor:
Roger D. Congdon
Publikováno v:
Geological Society of America Abstracts with Programs.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90a344e59bfc5fe63b8a2657fea67a07
https://doi.org/10.1130/abs/2016am-281485
https://doi.org/10.1130/abs/2016am-281485
Autor:
Roger D. Congdon, Timothy D. Mayer
Publikováno v:
Ground Water. 46:212-227
As development of ground water resources reaches the limits of sustainability, it is likely that even small changes in inflow, outflow, or storage will have economic or environmental consequences. Anthropogenic impacts of concern may be on the scale
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1586132190c10e4157aad98869051273
https://doi.org/10.1111/j.1745-6584.2007.00381.x
https://doi.org/10.1111/j.1745-6584.2007.00381.x
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 106:113-134
Carboniferous tonsteins (kaolinized volcanic-ash beds) of wide geographic distribution are known in both Europe and North America. Relict volcanic minerals common in these Euramerican tonsteins are volcanic quartz (including beta-quartz paramorphs),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e916a78b3cd9c2d324b8b7b381bcbaf
https://doi.org/10.1016/0031-0182(94)90006-x
https://doi.org/10.1016/0031-0182(94)90006-x
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
Autor:
W. P. Nash, Roger D. Congdon
Publikováno v:
Geology. 16:1018
The Honeycomb Hills rhyolite dome in western Utah displays chemical and mineralogical features characteristic of a rare-element pegmatite magma. The lavas show extreme enrichments in such trace elements as Rb (≤1960 ppm), Cs (≤78), Li (≤344), S
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::320038fe1ddbca64c77fb2b0a38a5082
https://doi.org/10.1130/0091-7613(1988)016<1018:hfraep>2.3.co
https://doi.org/10.1130/0091-7613(1988)016<1018:hfraep>2.3.co