Property:Caption

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C
Map of the Illinois Basin, showing the extent of Pennsylvanian rocks, thickness of the Springfield Coal, and channels interrupting the coal. From Finley et al. (2005).  +
Correlation chart showing position of key units within the Pennsylvanian Subsystem. Global and provincial stage boundaries and ages in millions of years (Ma) are from Gradstein et al. (2012)  +
Satellite image of the mouth of the Mississippi River, showing natural levees and crevasse splays. Source of image: Google Earth.  +
Diagram showing units between the Houchin Creek and Herrin Coals, including members newly named in this report.  +
Wireline log illustrating the typical response of key units. (a) Electric log of Carter Oil #1 Beers well in Sec. 28, T8S, R4E, Williamson County, Illinois (county no. 2107). (b) Gamma-ray–resistivity log of Peabody Natural Gas #2 Short, in Sec. 14, T7S, R7E, Hamilton County (county no. 25375).  +
Wireline log illustrating the typical response of key units. (a) Electric log of Carter Oil #1 Beers well in Sec. 28, T8S, R4E, Williamson County, Illinois (county no. 2107). (b) Gamma-ray–resistivity log of Peabody Natural Gas #2 Short, in Sec. 14, T7S, R7E, Hamilton County (county no. 25375).  +
Graphic logs from cores serving as type sections of the newly named members: (a) Energy Plus borehole #ME-13 in Sec. 31, T4S, R6E, type section of Delafield Member. (b) Kerr-McGee borehole #7629-16 in Sec. 29, T7S, R6E, Saline County, type section of the Galatia Member.  +
Isopach map of the Delafield Member. From Wanless et al. (1970). Thicknesses are in feet.  +
Map from Potter (1962), showing the thickness (in feet) of sandstone between the Houchin Creek and Springfield Coals, with the Galatia channel (from Hopkins 1968) superimposed.  +
Photograph showing underclay of the Springfield Coal at American Coal’s Galatia Mine, Saline County, Illinois. Field of view approximately 5 ft (1.5 m) square.  +
Map showing the thickness and mined areas of the Springfield Coal throughout Illinois. From Treworgy et al. (1999).  +
Photographs showing thinly interlaminated shale and dull to bright coal along margins of the Galatia channel at the Prosperity Mine in Gibson County, Indiana. The lower frame is a closer view of the upper.  +
Cross section of Galatia channel in American Coal’s Galatia Mine in Saline County, Illinois, based on core drilling and observations in mine.  +
Photographs showing the ragged, erosive contact between light-colored siltstone of the Dykersburg Member and the underlying coaly shale of the Galatia Member, in the channel crossing at Galatia Mine, Saline County. (a) View of the east wall of the entry. Coaly shale of the Galatia Member grades laterally northward (left, out of view) to shaly Springfield Coal. The pick is approximately 2 ft (60 cm) long. (b) Close-up view on the west wall of the entry. The heart of the Galatia channel is south (left) of view. Notice how erosion undercut the clay below layers of tough, fibrous peat.  +
Map showing the thickness of the Dykersburg Member in the vicinity of Galatia channel in southeastern Illinois. From Treworgy et al. (1999).  +
Photograph showing rhythmic lamination in sandy facies of the Dykersburg Member in American Coal’s Millennium Mine, Saline County, Illinois.  +
Photograph showing rhythmic lamination in sandy facies of the Dykersburg Member in the Millennium Mine, with lamination offlapping the top of the coal. Sediment thus was deposited in a wedge, prograding from left to right.  +
Photographs showing large, well-preserved fronds of fossil plant foliage (Laevenopteris?) in the Dykersburg Member at Millennium Mine, Saline County, Illinois.  +
Photograph of an upright tree stump, rooted at the top of the coal and encased in mudstone of the Dykersburg Member, at American Coal’s Galatia Mine in Saline County, Illinois.  +
Photograph of “rolls” at the top of the Springfield Coal, filled with Dykersburg sediments, at American Coal’s Millennium Mine in Saline County, Illinois. Ragged splaying of coal layers at the margins of rolls evokes fibrous peat layers ripped out by strong currents.  +