Bulletin, Issue 37

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University of Illinois, 1919 - Geology
 

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Page 15 - Hennepin" Canal joins Illinois River near Bureau and extends up the valley of Bureau Creek, paralleling the main line of the Rock Island Railroad. The Chicago and Northwestern, the Chicago, Milwaukee, and St. Paul, and the Chicago, Indiana, and Southern railroads also enter the area. The Illinois Valley Electric Railroad of the McKinley System does an important interurban business in the district. Wagon roads are excellent, and there are several miles of the so-called "State-aid" roads radiating...
Page 39 - STRATIGRAPHY dolomite, and thought to represent the residual soil. Above this shale the lower 3 feet or so of the sandstone usually contains a large number of oolitic flints. The following section observed along Pecumsaugan Creek includes the zone of contact with the limestone. Character of strata at the base of the St. Peter sandstone and the top of the Shakopee dolomite along, Pecumsaugan Creek Along Tomahawk Creek near the NW. cor. sec. 35, Dimmick Township (T.
Page 50 - Straiigraph^ sequence. — The stratigraphic sequence of the formation can be apparently correctly interpreted only from the succession found in the vicinity of Deer Park. The following drilling record of a well located at the power house in Deer Park gives the most complete section of the Pottsville available and shows the relation of the formation to the underlying and overlying strata. Driller's record of a well at the power house in Deer Park, in the SB.
Page 72 - In the various drilling records that have been given, sections of this silt bed are shown at the base of the Illinoian till. Such a deposit is found in many of the deep drift wells and coal borings of the area especially in the Hennepin quadrangle. In places it probably acts as a reservoir for natural gas originating in the drift. ILLINOIAN DRIFT The greatest mass of drift in the area is probably of Illinoian age. It is found at the surface in most places where Wisconsin drift has been eroded. In...
Page 37 - ST. PETER SANDSTONE CHARACTER AND DISTRIBUTION Upon the Shakopee dolomite lies the St. Peter sandstone, so named from its occurrence along the St. Peter (now known as Minnesota) River in Minnesota. The following table shows the thickness of the St. Peter sandstone in nine wells where accurate measurements were made : Thickness of the St. Peter sandstone in nine wells of the Hennepin and La Salle quadrangles St. Bede College Cedar Point Princeton Matthiessen <fe Hegeler Zinc Co. . Deer Park (Central...
Page 35 - The a real geology maps indicate the position of the outcrops. FIG. 10. — Shakopee dolomite, showing the brecciated structure. Wherever the dolomite is present along streams, gorges have been cut into the rock resulting in cliffs that in places reach a height of 60 to 75 feet (fig. 9). In the valley of the Illinois near...
Page 59 - Springfield (No. 5) coal. — Over the coal where it occurs normally is about 10 feet of dark-gray shale. This varies, however, to black, sheety shale or to limestone. Normally the overlying shale is brown and micaceous resembling the brown shale below the fire clay. In places the roof shale is overlain by sandstone of Carbondale age which may cut into or even apparently through it and cut out the coal and associated strata entirely.
Page 90 - FIG. 30. — Normal faults in Black Hollow mine. miles east of La Salle, to nearly north and southeast of Bailey Falls and west of Lowell. The steeply dipping west limb of the anticline has a width of STRUCTURE one-half to three-quarters of a mile along Illinois River and at Deer Park, but the strata continue to rise for about one-half mile east of the steep inclination. To the northwest and to the south the dip of the west limb apparently becomes less abrupt than it is along the Illinois, but exact...
Page 105 - ... to its uniformity of character and the desirable mining conditions the La Salle (No. 2) or "Third Vein" coal is of great economic importance in considerable areas in La Salle, Bureau, Putnam, Grundy, and Will counties in northern Illinois. The coal district embracing these counties is known as the Longwall District, because of the method used in mining the coal. This bed underlies about one-half of the area of the Hennepin and La Salle quadrangles. East of the anticline the La Salle coal is commonly...
Page 90 - Oglesby mine. FIG. 32.— Step fault in Dalzell shaft, Spring Valley Coal Company. Because of this structure the La Salle coal, which east of the anticline has an altitude of 610 feet or slightly more, west of the anticline in the trough parallel to the fold has an altitude of only about 100 feet above sea level. All the Pennsylvanian strata west of the fold dip eastward or southeastward at a low rate averaging about...

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