Brett J. Valentine
Brett Valentine is a Physical Scientist with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Since joining the USGS in 2009, Brett has devoted his career to studying organic petrology and specializes in electron microscopy techniques. He is currently the manager of the Reston Electron Microbeam Laboratory at USGS National Center in Reston, VA. Presently, his research focuses on developing electron microscopy methods and applications to improve our understanding of the micro-to-nanoscale changes that occur to coals and organic-rich shales as they thermally mature.
Professional Experience
Physical Scientist, USGS Geology, Energy & Minerals Science Center, 2009-Present
Assistant County Soil Scientist, Fauquier County, VA, 2004-2009
Education and Certifications
B.S. Forestry and Environmental Science, Virginia Tech
Science and Products
A review of the lignite resources of Arkansas
A review of lignite resources of western Tennessee and the Jackson Purchase area, western Kentucky
Paleocene coal deposits of the Wilcox Group, Northeast Texas
Paleocene coal deposits of the Wilcox group, central Texas
Wilcox group (Paleocene to Eocene) coals of the Sabine Uplift area, Texas and Louisiana
Front matter: Preface, acknowledgements, table of contents
Executive summary - Geologic assessment of coal in the Gulf of Mexico coastal plain, U.S.A.
Eocene Yegua Formation (Claiborne group) and Jackson group lignite deposits of Texas
Introduction
Coal resources for part of the Wilcox group (Paleocene-Eocene), northeast Texas
Coal resources for part of the Wilcox group (Paleocene through Eocene), central Texas
Upper Cretaceous bituminous coal deposits of the Olmos Formation, Maverick County, Texas
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A review of the lignite resources of Arkansas
This review of the lignite resources of Arkansas is a part of the U.S. Geological Survey's (USGS) National Coal Resource Assessment (NCRA) of the Gulf Coastal Plain Coal Province, which also includes coal-bearing areas in the states of Texas, Louisiana, Alabama, Mississippi, Tennessee, and Kentucky (see Ruppert et al., 2002; Dennen, 2009; and other chapters of this publication). Lignite mining isAuthorsPaul C. Hackley, Jason C. Willett, Peter D. Warwick, S.J. Law, Douglas J. NicholsA review of lignite resources of western Tennessee and the Jackson Purchase area, western Kentucky
This review of the lignite deposits of western Tennessee and the Jackson Purchase area in western Kentucky (Figure 1) is an updated report on part of the U.S. Geological Survey's National Coal Resource Assessment of the Gulf Coastal Plain Coal Province (see Ruppert et al., 2002; Hackley et al., 2006; Dennen, 2009; and other chapters of this publication). Lignite deposits of western Kentucky and TeAuthorsPaul C. Hackley, Peter D. Warwick, Roger E. Thomas, Douglas J. NicholsPaleocene coal deposits of the Wilcox Group, Northeast Texas
The surface exposure of the Paleocene Wilcox Group in northeast Texas varies in width from 9 to 27 mi along an arcuate outcrop that extends southwest approximately 156 mi from the Texas-Arkansas State line to 32° latitude. Parts of Bowie, Camp, Cass, Franklin, Henderson, Hopkins, Morris, Navarro, Rains, Titus, Van Zandt, and Wood Counties are included in this outcrop belt (Figure 1). This area forAuthorsRobert W. Hook, Peter D. Warwick, John R. SanFilipo, Douglas J. Nichols, Sharon M. SwansonPaleocene coal deposits of the Wilcox group, central Texas
Coal deposits in the Wilcox Group of central Texas have been regarded as the richest coal resources in the Gulf Coastal Plain. Although minable coal beds appear to be less numerous and generally higher in sulfur content (1 percent average, as-received basis; table 1) than Wilcox coal deposits in the Northeast Texas and Louisiana Sabine assessment areas (0.5 and 0.6 percent sulfur, respectively; taAuthorsRobert W. Hook, Peter D. Warwick, John R. SanFilipo, Adam C. Schultz, Douglas J. Nichols, Sharon M. SwansonWilcox group (Paleocene to Eocene) coals of the Sabine Uplift area, Texas and Louisiana
The Wilcox Group (Paleocene to Eocene) of the Sabine uplift, a structural arch in northeastern Texas and northwestern Louisiana (Figure 1), has lignite zones that approach subbituminous rank (see Chapter 4, this publication). These coals are among the highest quality resources known within the Gulf Coastal Plain because of their low ash yield and sulfur content. The surface expression of the SabinAuthorsRobert W. Hook, Peter D. Warwick, John R. SanFilipoFront matter: Preface, acknowledgements, table of contents
This volume is the fifth in a series of reports by the U.S. Geological Survey (USGS) on the assessment of the quantity and quality of the nation’s coal deposits that potentially could be mined during the next few decades. For eight years (1995-2003), geologic, geochemical, and resource information was collected and compiled for the five major coal-producing regions of the United States: the AppalaExecutive summary - Geologic assessment of coal in the Gulf of Mexico coastal plain, U.S.A.
The National Coal Resource Assessment (NCRA) project of the U.S. Geological Survey (USGS) has assessed the quantity and quality of the nation's coal deposits that potentially could be mined during the next few decades. For eight years, geologic, geochemical, and resource information was collected and compiled for the five major coal-producing regions of the United States: the Appalachian Basin, IlAuthorsPeter D. WarwickEocene Yegua Formation (Claiborne group) and Jackson group lignite deposits of Texas
The lignite deposits within the upper Eocene Yegua Formation (Claiborne Group) and the overlying Jackson Group are among the coal resources that were not quantitatively assessed as part of the U.S. Geological Survey's (USGS) National Coal Resource Assessment (NCRA) program in the Gulf Coastal Plain coal province. In the past, these lignite-bearing stratigraphic units often have been evaluated togeAuthorsRobert W. Hook, Peter D. Warwick, Sharon M. Swanson, Paul C. HackleyIntroduction
The National Coal Resource Assessment (NCRA) team of the U.S. Geological Survey (USGS) has assessed the quantity and quality of coal beds and zones that could be mined during the next 20 years or more. Geologic, geochemical, and resource information was collected and compiled for the five major coal-producing regions of the United States: the Appalachian Basin, Illinois Basin, Northern Rocky MountAuthorsPeter D. Warwick, Robert W. Hook, John R. SanFilipoCoal resources for part of the Wilcox group (Paleocene-Eocene), northeast Texas
The Wilcox Group of northeast Texas contains shallow (less than 500 ft) coal deposits that are mined for use in mine-mouth electric power generating plants. The coal deposits, which are lignite in apparent rank (Pierce et al., 2011), are separated from similar shallow coal deposits in the Sabine uplift area by the East Texas Basin (Figure 1). The coal zones and associated strata in the northeast aAuthorsPeter D. Warwick, Claire E. Aubourg, Steven M. Podwysocki, Adam C. SchultzCoal resources for part of the Wilcox group (Paleocene through Eocene), central Texas
The Wilcox Group of central Texas contains shallow (less than 500 ft) coal deposits that are mined for use in mine-mouth electric power generating plants. These coal deposits range in apparent rank from lignite to sub-bituminous (Pierce et al., 2011) and are similar in rank and composition to shallow coal deposits in the northeast and south Texas areas (Figure 1). The coal zones and associated strAuthorsPeter D. Warwick, Claire E. Aubourg, Stephen E. Suitt, Steven M. Podwysocki, Adam C. SchultzUpper Cretaceous bituminous coal deposits of the Olmos Formation, Maverick County, Texas
This report describes the bituminous coal deposits of the Olmos Formation (Navarro Group, Upper Cretaceous; Figures 1, 2) of Maverick County in south Texas. Although these were not evaluated quantitatively as part of the current Gulf Coastal Plain coal-resource assessment, a detailed review is presented in this chapter.Prior to the late 1920s, these coal beds were mined underground on a large scalAuthorsRobert W. Hook, Peter D. Warwick, John R. SanFilipo - Web Tools