Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Wallace De Witt"'
Autor:
Wallace De Witt, R. F. Meyer
Natural bitumens, semisolid or solid mixtures of hydrocarbons and as much as 50 percent heterocyclic compounds, are composed largely of carbon and hydrogen but have substituents of nitrogen, oxygen, sulfur, and trace metals, especially iron, nickel,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a876376496b221784227813fac661c6
https://doi.org/10.3133/b1944
https://doi.org/10.3133/b1944
Autor:
Wallace de Witt, Robert Oliver Bloomer
Publikováno v:
Economic Geology. 36:745-747
A lenticular fossil placer deposit of titaniferous minerals, discovered in 1939 near Buena Vista, Virginia, suggests that future studies might disclose some tin-bearing sandstone along the western flanks of the Blue Ridge.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd1cf27f073dae1c1ed1988aa7f5db55
https://doi.org/10.2113/gsecongeo.36.7.745
https://doi.org/10.2113/gsecongeo.36.7.745
The purpose of this cross section, which is one of a series, is to provide a preliminary regional stratigraphic framework and provisional nomenclature as a base for future detailed mapping and geologic analyses of the Devonian black shales. Data from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10dca214912b055d8c765d6f6f108a1e
https://doi.org/10.3133/oc82
https://doi.org/10.3133/oc82
Autor:
Wallace de Witt
The Devonian gas shales of the Appalachian basin constitute a sequence of dark brownish-gray to black laminated rocks that contain 0.5 to 20 weight percent (wt%) organic matter, the source of the gas in the shale. The gas shales underlie about 170,00
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::36b971c7832a9077ab696bd15c7594e6
https://doi.org/10.1306/st24459c1
https://doi.org/10.1306/st24459c1
Publikováno v:
Open-File Report.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e9447d639eed0ca219e26342e4554206
https://doi.org/10.3133/ofr75267
https://doi.org/10.3133/ofr75267