Browsing by Author "Thompson, Todd Alan"
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Item Anatomy of the Grainstone Shoal Facies of the Salem Limestone (Mississippian) of Southern Indiana (A Preliminary Report)(Indiana Geological & Water Survey, 1993) Thompson, Todd Alan; Dodd, J.; Petzold, DanielItem Architectural Elements and Paleoecology of Carbonate Shoal and Intershoal Deposits in the Salem Limestone (Mississippian) in South-Central Indiana(Indiana Geological & Water Survey, 1990) Thompson, Todd AlanItem Bedrock Geologic Map of Monroe County, Indiana(Indiana Geological Survey, 2008) Hasenmueller, Walter A.; Estell, Carolyn M.; Keith, Brian D.; Thompson, Todd AlanItem Corebook of Carbonate and Associated Rocks in Indiana(Indiana Geological & Water Survey, 2015) Keith, Brian D.; Thompson, Todd AlanItem Directory of Sand and Gravel Producers in Indiana - 1988(Indiana Geological & Water Survey, 1988) Thompson, Todd AlanItem Generalized stratigraphic column of Indiana bedrock(Indiana Geological & Water Survey, 2015) Sowder, Kimberly; Thompson, Todd Alan; Johnson, Matthew R.Item Generalized stratigraphic column of Indiana bedrock (6A)(Indiana Geological & Water Survey, 2015) Sowder, Kimberly; Thompson, Todd Alan; Johnson, Matthew R.Item Geologic map of glacial and post-glacial deposits, northern Lake County, Indiana(Indiana Geological & Water Survey, 2005) Brown, Steven E.; Thompson, Todd AlanItem Geologic Map of Lawrence County, Indiana(Indiana Geological Survey, 2014) Keith, Brian D.; Thompson, Todd Alan; Herrmann, Edward; Rupp, Robin F.; Hasenmueller, Walter A.Item Geologic map of the Bloomington 7.5-minute quadrangle(Indiana Geological & Water Survey, 2008) Hasenmueller, Walter A.; Keith, Brian D.; Thompson, Todd Alan; Estell, Carolyn M.Item Geologic Map of the Clear Creek 7.5-Minute Quadrangle, Indiana(Indiana Geological & Water Survey, 2009) Hasenmueller, Walter A.; Keith, Brian D.; Thompson, Todd Alan; Estell, Carolyn M.Item Geologic Terrains of Northwestern Lake County, Indiana(Indiana Geological & Water Survey, 1995) Brown, Steven E.; Thompson, Todd AlanItem Geologic terrains of the Chicago 30 x 60 minute quadrangle in Indiana(Indiana Geological & Water Survey, 1995) Brown, Steven E.; Thompson, Todd AlanItem Land-based Vibracoring and Vibracore Analysis: Tips, Tricks, and Traps(Indiana Geological & Water Survey, 1991) Baedke, Steven J.; Miller, Charles S.; Thompson, Todd Alan; Thompson, Linda D. P.; Doss, Paul K."INTRODUCTION: Vibracorers have seen increasing since they were introduced in the 1960's. Once a tool of research vessels and institutions along ocean coastlines (Pierce and Howard, 1969; Lanesky and others, 1979; Hoyt and Demarest, 1981; Finkelstein and Prins, 1981), small, portable vibracorers are now used on coastlines throughout the world and in many nonmarine settings (Smith, 1984). Their proliferation is a result of the vibracorers' low construction, field cost, and portability, the relatively undisturbed samples they obtain and moderate depths to which they penetrate. Most vibracorers are based on the design of Lanesky and others (1979) and Finkelstein and Prins (1981). Both designs use a concrete vibrator to set up an oscillation in a piece of aluminum irrigation pipe. The base of the core tube liquifies the underlying sediment, and the core tube sinks into the ground under its own or added weight. All vibracoring systems require the water table to be at or near the ground surface. Consequently, most vibracorers are used at the margins of water bodies, and in or near wetlands along floodplains and coasts. Personnel at the Indiana Geological Survey (IGS) have used a vibracorer since 1985. More than 200 cores have been collected in coastal, fluvial, and wetland sediments of northwestern Indiana. The cores constitute a valuable data set for describing the shallow subsurface geology of the area and determining the depositional history of Lake Michigan (Thompson, in press). Other cores of slurry-pond sediments have been collected in southwestern Indiana. There, the vibracorer was used to sample fine-grained coal refuse and to install shallow monitoring water wells. This paper describes the IGS vibracorer and vibracoring techniques. Most vibracorers can collect an undisturbed sample of a variety of sediment types, including sand, silt, and peat, in a range of depths from 10 to 25 feet. Problems encountered with vibracorers (poor penetration and recovery) can be overcome. We present numerous tips and pitfalls in constructing a vibracorer and maximizing core recovery."Item Map showing surficial and bedrock geology of Indiana(Indiana Geological & Water Survey, 2005) Sowder, Kimberly; Thompson, Todd AlanItem Natural Gamma-Ray Log Profiles and Maps Showing Locations of Data Points and Geologic Terrains of the, Gary 7.5 Minute Quadrangle, Indiana(Indiana Geological & Water Survey, 1994) Brown, Steven E.; Thompson, Todd AlanItem Preliminary analysis of Middle Holocene lake-level change of ancestral Lake Superior, Huron Mountains, upper Michigan(Indiana Geological & Water Survey, 2015) Loope, Henry M.; Johnson, John W.; Thompson, Todd Alan; Lepper, KennethItem Preliminary bedrock geologic map of the Bartlettsville 7.5-minute Quadrangle, Indiana(Indiana Geological & Water Survey, 2008) Hasenmueller, Walter A.; Keith, Brian D.; Thompson, Todd Alan; Estell, Carolyn M.Item Preliminary Bedrock Geologic Map of the Bedford East 7.5-minute Quadrangle, Indiana(Indiana Geological Survey, 2009) Thompson, Todd Alan; Keith, Brian D.; Estell, Carolyn M.; Hasenmueller, Walter A.Item Preliminary bedrock geologic map of the Bedford West 7.5-minute Quadrangle, Indiana(Indiana Geological & Water Survey, 2009) Hasenmueller, Walter A.; Keith, Brian D.; Thompson, Todd Alan; Estell, Carolyn M.