Illinois State Geological Survey bulletin, Issue 19 (Google eBook)

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1912
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Page 2 - STATE GEOLOGICAL COMMISSION EDWARD F. DUNNE, Chairman Governor of Illinois THOMAS C. CHAMBERLIN, Vice-Chairman EDMUND J. JAMES, Secretary President of the University of Illinois FRANK W.
Page 69 - In general, the results of all slow processes working on the land mass are degradational rather than aggradational. CHAPTER V CONCLUSION. From all the foregoing observations it is seen that various processes, and the same processes at various times, have been in operation to bring about the present land conditions in this region. Seas once covered the region. Sands and muds were worn from adjacent land masses by the processes of weathering and erosion, were transported to the sea by streams, and...
Page 12 - FORMATIONS BENEATH THE REGION. The limestone of the Wheaton quadrangle has been identified as Niagran. It is similar in appearance and constitution to rocks of known Niagaran age in other regions in the interior of the continent, for example along the Chicago drainage canal. Furthermore, the nearly horizontal beds exposed in the drainage canal would, if continued, underlie this region at no great depth. Again this rock, as at the quarries at Naperville, contains the same fossils as the Niagaran limestone...
Page 74 - ... the St. Louis Area: by NM Fenneman. An educational bulletin describing the physiographic and geologic features of the region and including a colored geological map of the area. This is especially designed to meet the needs of teachers in the public schools. 81 pages, 18 plates, 10 figures. Postage 6 cents. Bulletin 13. The Mississippi Valley between Savanna and Davenport: by J. Ernest Carman.
Page 70 - Gravel 4 97 To rock 97 62 Gravel 62 See table of deep wells 71 Gravel and blue clay 70 Rock 1 112 To rock 100 Rock 12 100 Gravel and clay 64 Rock 36 26 Bottom in sand 86 Bottom in rock ." 140 Soil, loam and clay 7 Quicksand with yellow clay 5 Clay 113 Rock : 15 90 Clay and hard pan : 30 Rock...
Page 24 - ... be buried in the drift which the ice was depositing. After the recession of the edge of the ice, the melting of these buried blocks would let the overlying drift down, thus forming a depression. (2) Depressions might also be formed by a crossing and recrossing of subordinate terminal morainic Figure 3. Sketch showing how a kettle hole might be formed by a crossing and recrossing of subordinate terminal moraini c ridges. ILLINOIS STATE GEOLOGICAL SURVEY. BULL. NO. 19, PL, III. A. The terminal...
Page 55 - The largest and best developed part of the first esker is on the farm of Edward Kearns. It is a ridge some 20 feet high, standing above the gently rolling ground moraine about it, and easily discernible from both the north-south road, a few hundred yards east of its east end and from the east- west road one-fourth mile to the south (PI. XI, A). The ridge is not straight, but has a course much like a somewhat straightened letter S. (See map, PI.
Page 32 - Most of the material is stiff clay, sticky when wet, and hard and stiff when dry. A fresh, wet surface is usually grayish blue. Weathered surfaces are dull yellow. The clay is the matrix of the till, and the stony matter is embedded irregularly in it. The toughness of the clay has earned for the till the name of "hardpan." (PI. V, B.) The stony matter is made up mostly of limestone, but comprises some sandstone, some diabase, and granite, and some bits of shale. These rocks are usually in small...

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