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Roger E. Thomas

Publications and source records attributed to Roger E. Thomas.

15 recordsLinked to original sources
USGS2011

A 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 Tennessee are an extension of the Gulf Coastal Plain Coal Province (Cushing et al., 1964), and currently are not economic to mine. These deposits have not been extensively investigated or developed as an energy resource. This review includes a description of the geology of the lignite-bearing units, a discussion of the available coal quality data, and information on organic petrology. Palynological data for lignite samples collected in Kentucky and Tennessee as part of this work are presented in Table 1. Lignite trace element data originally presented in Hackley et al. (2006) are not included in this report due to potential laboratory quality control issues during the time the samples were analyzed (U.S. Geological Survey Energy Resources Program, 2010).

Kentucky, Tennessee↗
USGS2006

Review of lignite resources of western Tennessee and the Jackson Purchase area, western Kentucky

Introduction: This review of the lignite deposits of western Tennessee and the Jackson Purchase area in western Kentucky (Fig. 1) is a preliminary report on part of the U.S. Geological Survey's National Coal Resource Assessment of the Gulf Coastal Plain Coal Province. Lignite deposits of western Kentucky and Tennessee are an extension of the Gulf Coastal Plain Coal Province (Cushing and others, 1964), and currently are not economic to mine. These deposits have not been extensively investigated or developed as an energy resource. This review includes a description of the geology of the lignite-bearing units, a discussion of the available coal quality data, and information on organic petrology. Palynological data for lignite samples collected in Kentucky and Tennessee as part of this work are presented in an Appendix.

Open-File Report↗
USGS1994

Report on drilling activities in the Thar Desert, Sindh Province, Pakistan

Coal test drilling in the Thar Desert of southeast Pakistan was conducted as part of the Coal Exploration and Assessment Program (COALREAP) involving the United States Agency for International Development (USAID), the Geological Survey of Pakistan (GSP), and the U.S. Geological Survey. Drilling was performed in the Thar Desert, or Great Indian Desert, approximately 175 km northeast of Karachi. Twenty five exploration holes were drilled between January 1992 and May 1994. Drill core was described by geologists of the Pakistan Geological Survey and coal samples were analyzed in both the United States and Pakistan. U.S. Geological Survey geologists offered technical assistance, trained GSP personnel, and managed the drilling program according to an agreement with USAID under the Energy Planning and Development Project. Drilling was performed by the Geological Survey of Pakistan. During drilling, the first 50 m was rotary drilled and cuttings collected every 2 m for examination. Average depth for all coal beds is 214 m with a total average thickness of 10 m of coal per drill hole. Core was described, boxed, and stored at the Geological Survey of Pakistan core library at Sonda, near Hyderabad. Approximately 6,412 m of Paleocene to Eocene rock was drilled of which 3,990 m was cored and 1,113 m was rotary drilled. There was 1,309 m of core loss. Geophysical logging of each drill hole permitted detailed thicknesses of coal to be determined. Analysis of the coal indicated a rank of lignite B with an as-received heating value over 5,000 Btu. This report presents data collected at the drill sites and should be used in conjunction with the published interpretive report (Fassett and Durrani, 1994) and the USGS Open-File Report 94-167, which contains analysis of the coal samples. Tables provide quick reference to numeric data and results. Detailed index maps and specific data, for each drill hole are included. This report covers drill holes TP-5 to TP-31. Drill holes TP-16, 17, 21, 26, 27, and 29 were planned but not drilled due to time restraints and (or) a determination that those drill sites were not needed to effectively delineate the coal deposit. The basic data for drill holes TP-1 through TP-4 are included in SanFilipo and others, 1994 however, some data for these drill holes are included for consistency.

Sindh Province↗
USGS1991

Coal resources of Tazewell County, Virginia, 1980

Economically important coal beds of Pennsylvanian age underlie about 96 square miles in the northwestern part of Tazewell County in the southwestern Virginia coal field. Coal in Tazewell County ranges in rank from low-volatile to high-volatile A bituminous and generally increases in rank with depth. On an as-received basis, most of the coal is relatively low in ash and high in heat value. Analyses of trace element and major and minor oxide composition of 22 coal beds in Tazewell County indicate that none of the samples contain significant amounts of either potentially toxic or economically valuable trace elements. Of 60 coal beds in Tazewell County, 37 beds are of sufficient thickness and extent to merit calculation of resources.

Virginia↗
USGS1990

Late Paleozoic depositional trends in the central Appalachian Basin

Trends in the regional extent, stratigraphical distribution, and character of upper Paleozoic terrestrial rocks in the central Appalachian basin were influenced by depositional events associated with basin evolution. Most of these rocks originated as siliciclastic detritus eroded from tectonic highlands that were elevated by plate collision along the southeastern margin of the basin. Terrestrial sediments, indicated by northwestward-prograding delta lobes and fluvial systems, were deposited in a slowly subsiding foreland basin. Concurrently, marine deposition encroached from the northwest in a shallow epicontinental sea that covered an unstable cratonic shelf. Terrestrial progradation extended northwestward during periods of high rainfall and sufficient subsidence to accommodate a high influx of clastic sediments. Conversely, marine incursions extended farthest southeastward during periods of diminishing rainfall and low clastic influx. As the Appalachian basin evolved, terrestrial deposition gradually shifted northwestward and occupied the entire basin by Early Permian time. In addition, the standline or wedgeout of terrestrial coal-bearing deposits rotated from N 30°E in Early Mississippian time to N 65° E in Early Pennsylvanian time. -from Authors

Alabama, Georgia, Kentucky, Maryland, Ohio, Pennsy↗
USGS1989

Lateral relationships in the Laki formation, Ganjo Takkar and Saidpur outlier, Hyderabad District, Sind Province, Pakistan

The sections presented were measured in an unstudied area southeast of the city of Hyderabad and 175 km northeast of Karachi, capital of Sind Province in southern Pakistan. These sections are preliminary to more detailed studies, particularly of the fossil fauna and the Paleocene and Eocene stratigraphy in southern Pakistan. The data present a major elucidation of the lateral relationships of individual rock units that collectively form part of the Laki Formation exposed in the Ganjo Takkar and nearby Saidpur outlier.

Miscellaneous Field Studies Map↗