Drift Thickness of Oak Hill Quadrangle, Peoria County, Illinois

              Illinois Geologic Quadrangle Map
IGQ Oak Hill-DT
Base map compiled by Illinois State Geological Survey from digital data provided by the United States Geological Survey. Surface topography and planimetry compiled from imag­ery dated 1994. Digital base created 1996.
North American Datum of 1983 (NAD 83)
Projection: Transverse Mercator
10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator)
1,000-meter ticks: Universal Transverse Mercator grid system, zone 16
Recommended citation:
Weibel, C.P., and F. Hardy, 2007, Drift Thicknesss of Oak Hill Quadrangle, Peoria County, Illinois: Illinois State Geological Survey, Illinois Geologic Quadrangle Map, IGQ Oak Hill-DT, 1:24,000.
Geology based on data collection and analysis by C.P. Weibel and F. Hardy, 2000–2001.
Digital cartography by C.P. Weibel, T. Goeppinger, J. Carrell, Z. Golshani, and J. Domier, Illinois State Geological Survey.
The Illinois State Geological Survey, the Illinois Department of Natural Resources, and the State of Illinois make no guarantee, expressed or implied, regarding the correctness of the interpretations presented in this document and accept no liability for the consequences of decisions made by others on the basis of the information presented here. The geologic interpretations are based on data that may vary with respect to accuracy of geographic lo­cation, the type and quantity of data available at each location, and the scientific/technical qualifications of the data sources. Maps or cross sections in this document are not meant to be enlarged.
IGQ Oak Hill-DT
DRIFT THCKNESS OF OAK HILL QUADRANGLE
PEORIA COUNTY, ILLINOIS
C. Pius Weibel and François Hardy
20071°APPROXIMATE MEANDECLINATION, 2007MAGNETIC NORTHTRUE NORTHROAD CLASSIFICATIONPrimary highway,hard surfaceSecondary highway,hard surfaceLight-duty road, hard orimproved surfaceUnimproved roadInterstate RouteU.S. RouteState Route
ADJOINING
QUADRANGLES
1 Laura
2 Princeville
3 Edelstein
4 Elmwood
5 Dunlap
6 Farmington East
7 Hanna City
8 Peoria West
BASE MAP CONTOUR INTERVAL 20 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
For more information contact:Illinois State Geological Survey 615 East Peabody Drive
Champaign, Illinois 61820-6964
(217) 244-2414
http://www.isgs.uiuc.edu12345678
Released by the authority of the State of Illinois: 2007
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000 FEET10001000020003000400050006000.51 KILOMETER10SCALE 1:24,0001/2101 MILE
Illinois Department of Natural Resources
ILLINOIS STATE GEOLOGICAL SURVEY
William W. Shilts, Chief
Drift Thickness
This map depicts the thickness of Quaternary-age drift (glacial and postglacial sediment) that lies over Pennsylvanian bedrock (Carbondale Formation) in the Oak Hill Quadrangle. Drift is composed mostly of till (an unsorted and nonstratified mixture of clay, silt, sand, and rock clasts), outwash (sorted and stratified silt, sand, and gravel) and lacustrine deposits (clay and silt), and loess (wind-blown silt and fine sand). These sediments were deposited during the last two major episodes of glaciation over the last 500,000 years. Earlier Illinois Episode till blankets most of the quadrangle. An end moraine marking the westernmost extent of glaciers during Wisconsin Episode glaciation lies near the eastern edge of the quadrangle (fig. 1). Glacial outwash and loess (not shown on fig. 1), however, were deposited within the Oak Hill Quadrangle during this episode.
The thickness of the drift, which includes the modern soil, varies considerably across the quadrangle. The thickest drift, more than 200 feet, is present within a prominent southeast- trending bedrock valley near the southeastern corner of the quadrangle in Sections 11, 12, and 13, T9N, R6E. This bedrock valley generally parallels Kickapoo Creek, located just to the southwest. There are additional thick deposits of drift within the valley of the West Fork of Kickapoo Creek in the southwestern part of the quadrangle. Just over one-tenth of the quadrangle is covered by drift greater than 100 feet thick, all in the southern half. Drift that is 50 feet thick or less covers about two-thirds of the quadrangle. In this area small exposures of bedrock are numerous, cropping out primarily along streams and gullies. The considerable variation in drift thickness is mostly due to the irregular surface of the underlying bedrock (fig. 2). The modern land surface has less relief than the bedrock surface, but areas recently incised by Kickapoo Creek and its tributaries are evident in the thickness contours of this map. Contours of the drift thickness also reflect the many small water bodies in the quadrangle.
Map Use
The drift thickness map provides information that is useful in exploring for sand and gravel deposits within the Quaternary-age sediments. Thick sand and gravel deposits that infill bedrock valleys commonly are sources of abundant groundwater. Near-surface sand and gravel deposits may also be a source of construction aggregate. Drillers, engineers, and geoscientists can use this map to predict the depth to bedrock.
Mapping Methods
This map was derived using data from topographic maps (digital elevation models [DEMs]) of the bedrock surface (fig. 2) and the land surface. A 5-meter (16.4-foot) DEM of the land surface was prepared at the Illinois State Geological Survey using high resolution digital data provided by the Tri-County Regional Planning Commission. The digital data of the land surface include the elevations of the surfaces of water bodies. The ArcGIS Spatial Analyst raster calculator tool was used to subtract the elevations in the DEM of the bedrock surface (Weibel and Hardy 2007) from the DEM of the land surface. Because the land surface DEM has a resolution that is significantly better than that of the more generalized bedrock surface DEM, this resultant grid (cell size of about 164 feet) was skewed toward the higher resolution DEM. In other words, most of the topographic details in the resultant grid and its contours are derived from the land surface and few are from the bedrock surface. The initial contours were derived from the resultant grid using ArcGIS’s Surface Analysis Contour tool. These contours were manually edited to better fit the geological interpretation of the drift thickness of the quadrangle.
Weibel and Hardy (2007) included an inset map displaying locations of data used to derive the digital grid of the bedrock surface. The map was based on field data and data from subsurface borings held at the Geological Records Unit of the Illinois State Geologic Survey. The data consist of 161 field observations and 617 borings, including logs of water wells, engineering and structure borings, and ISGS stratigraphic test borings. Twenty data points derived from seismic refraction analyses were also used. This data map is also relevant to the drift thickness map.
References
Illinois State Geological Survey, 2000, Surficial deposits of Illinois [map], digitally adapted by B.J. Stiff; compiled from J.A. Lineback 1979; M.M. Killey and J.A. Lineback 1983; R.C. Berg et al. 1984, 1985; and A.K. Hansel and H. Johnson 1996: Illinois State Geological Survey, Open File Series 2002-7, 1:5,000,000.
Luman, D.E., L.R. Smith, and C.C. Goldsmith, 2003, Illinois surface topography: Illinois State Geological Survey, Illinois Map 11.
Weibel, C.P., and F. Hardy, 2007, Bedrock topography of Oak Hill Quadrangle, Peoria County, Illinois: Illinois State Geological Survey, Illinois Geologic Quadrangle Map, IGQ Oak Hill-BT, 1:24,000.
Willman, H.B., and J.C. Frye, 1970, Pleistocene stratigraphy of Illinois: Illinois State Geological Survey, Bulletin 94, 204 p.
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!!!!!!!!!PEORIAEASTPEORIADunlapBartonvilleChillicotheHannaCitySpring BayWashingtonGermantownHillsBrimfieldPrincevilleElmwoodWaterIllinois Episodetill plainWisconsin EpisodemoraineWisconsin Episodetill plainWisconsin Episodeoutwash plainPostglacial alluvialfloodplainMunicipal boundaryCounty boundaryOak Hill QuadrangleMILES0510
Figure 1 Surficial geology and shaded relief map (derived from a digital elevation model) of the Oak Hill Quadrangle area. The quadrangle (black outline) lies near the edge of Wisconsin Episode glacial deposits. Modified from Illinois State Geological Survey (2000), Luman et al. (2003), and Willman and Frye (1970).
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R. 5 E.R. 6 E.R. 6 E.R. 7 E.T. 9 N.T. 10 N.T. 9 N.T. 10 N.R. 5 E.R. 6 E.R. 6 E.R. 7 E.18131924121114231015222021169871217192418133216543331362530292861233435363130252627192423221514718131211102163241920211617181317894561Bedrock Elevation(feet above mean sea level) 750700 650600550500 450400012MILES500600600500500600600600700600500600600600
Figure 2 Topographic map of the bedrock surface of the Oak Hill Quadrangle. Contour interval is 50 feet. Simplified from Weibel and Hardy (2007).
Dr
ift Thickness(feet)100200225175150125755025100$TData TypeBedrock outcrop600680660600680600700700600660660680600660660600660680660600680600600600600600660600660700660600600660660600600500620600606406606606606406006006006006406406606006006005805406006406006606406006006006006005206605605606007006006007006005406006006006060060060066054060060066066054064064068066070060066070070068070066066064070066068070070074070070070070068070070074074070070070070700740242419232221201913181314151617187121110127896123456131363534333231363025262728293025192423222120192418131415161718137121109871261234561R. 5 E.R. 6 E.R. 6 E.R. 7 E.T. 9 N.T. 10 N.T. 9 N.T. 10 N.R. 5 E.R. 6 E.R. 6 E.R. 7 E.88741507415074150RunRunJubileeCreekTiberWestCREEKRuppRunDeerLickWarsaw Run KICKAPOO Nixon Run CreekCreek Hickory Fargo CREEK KICKAPOO Fork 25255050502510105050101050501002525502575502510025255010507510251025507525105010502525107510755010025255025505010075105025125750025105015025175101005075507525252510200200755050251002512550105075175105050200150150100505025125125757510050751505025100751505125501001002512575251001001257575507575257515075501251257575757510050505025125100751001007510075125507550501001010010075251255051005075755050255050255075257510255050502510252550255010752575505025507510252510752550501050252525101050107525102510502510251052510501025501025251050501025252510251025501025502525252510252510101025102510102525505010102510252510102525252510502510255025101505075252510255010251025255025102525501075$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T$T