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Publications by Tewalt, S.J.

Title Publication Year Abstract Author Series Publisher
Detailed evaluation of two Texas lignite deposits of deltaic and fluvial origins Detailed evaluation of two Texas lignite deposits of deltaic and fluvial origins 1982 Tewalt, S.J., Bauer, M.A., Mathew, David Geological Circular Bureau of Economic Geology
Chemical Characterization of Texas Lignite Chemical Characterization of Texas Lignite 1986

Statistical analysis of chemical data on Texas Eocene coals revealed startigraphic and geographic trends in lignite quality. Chemical data on near-surface coals wre obtained from various private and public sources. Seams from deep-basin coals were compared.

Tewalt, S.J. Geological Circular Bureau of Economic Geology
Estimation of lignite resources in the Wilcox Group of central and east Texas using the National Coal Resources Data System Estimation of lignite resources in the Wilcox Group of central and east Texas using the National Coal Resources Data System 1991

Since 1979, the U.S. Geological Survey (USGS) has funded cooperative programs with coal-bearing states in an effort to provide current U.S. coal resource estimates that are calculated by uniform, computerized methods.

Tewalt, S.J., Jackson, M.L.W. Geological Circular Bureau of Economic Geology
Estimation of coal resources in Texas Gulf Coast, Ohio northern Appalachian, and Wyoming Powder River Basins:  a comparison of statistical approaches Estimation of coal resources in Texas Gulf Coast, Ohio northern Appalachian, and Wyoming Powder River Basins: a comparison of statistical approaches 1983

Official estimates of United States coal resources published during the past 15 years vary from less than 1.5 to 3.5 trillion metric tons (1.7 to 3.9 trillion short tons). These differences imply that a high degree of uncertainty exists in resource assessment.

Tewalt, S.J., Bauer, M.A., Mathew, David, Roberts, M.P., Ayers Jr., W.B., Barnes, J.W., Kaiser, W.R. Report of Investigations Bureau of Economic Geology