INTRODUCTION. 33 



BIBLIOGRAPHY. 



The principal contributions to the glacial literature of this region are found in the official 

 reports of the several State geological surveys and of the United States Geological Survey. The 

 glacial lakes, however, have been more widely investigated and discussed by students working 

 at private expense, notably by Whittlesey, Andrews, Spencer, Taylor, and Goldthwait. The 

 bibliography here given embraces all sorts of discussions which touch on the glacial or lake 

 history of Indiana and the southern peninsula of Michigan, and is not confined to writings which 

 seem to have materially advanced the knowledge of these subjects. It is thought that a com- 

 prehensive bibliography of this sort may afford references that will be of service to anyone who 

 may wish to look more fully into any particular phase of Pleistocene history or literature. 



The preparation of tins bibliography required more than a year of reading and abstracting. 

 It contains condensed statements on many important subjects which, for lack of space, are not 

 taken up more fully in the monograph. 



Agassiz, Louis, The terraces and ancient river bars, drift, bowlders, and polished surfaces of Lake Superior: Proc. 

 Am. Assoc. Adv. Sci., vol., 1, 1849, pp. 68-70. 



Glacier ice is interpreted as having deposited the drift and striated the rocks, but the terraces are thought to 

 show the presence of water bodies high above the present lake. Their great altitude is referred to upheaval of 

 the land rather than to expansion of the water bodies. Glacial dams are not suggested. 



Lake Superior; its physical character, etc., Boston, 1850, pp. 395-416. 



Includes a discussion of the erratic phenomena. This discussion appears also in Am. Jour. Sci., 2d ser., vol. 

 10, 1850, pp. 83-101. ' 

 Alden, W. C., Chicago folio (No. 81), Geol. Atlas U. S., U. S. Geol. Survey, 1902. 



The Chicago outlet, the beaches of Lake Chicago, and the glacial deposits and strise at the head of Lake Mich- 

 igan are discussed. 



The Delavan lobe of the Lake Michigan glacier of the Wisconsin stage of glaciation and associated phenomena: 



Prof. Paper U. S. Geol. Survey No. 34, 1904, 106 pp. 



A small glacial lobe crowded in between the Lake Michigan and Green Bay lobes in southern Wisconsin is 

 described and is given the name Delavan. 



The drumlins of southeastern Wisconsin: Bull. U. S. Geol. Survey No. 273, 1905, 46 pp. 



The distribution of the drumlins in reference to moraines and eskers and the preglacial topography and general 

 configuration of the drift surface are considered; then the form and the structure are brought out. The drumlins 

 are said to be of different ages in different parts of southern Wisconsin, some being on the pre-Wisconsin and some 

 on the Wisconsin drift, but all are the latest product of glaciation in the region. Evidence as to the exact 

 method of formation is meager and indecisive and no conclusions seem warranted. 



■ Milwaukee folio (No. 140), Geol. Atlas U. S., U. S. Geol. Survey, 1906. 



Discusses the Pleistocene deposits and lacustrine features of a 15-minute quadrangle, taking in the site of Mil- 

 waukee, Wis., and contiguous territory. 



Radiation of glacial flow as a factor in drumlin formation: Bull. Geol. Soc. America, vol. 22, 1911, p. 733. 



Asserts that the radiation of glacial flow would probably develop longitudinal crevasses in which drumlin material 

 would accumulate. The crevassed portion is likely to have been shoved forcibly over its material by vigorously 

 advancing ice in the rear, and this might have shaped the crevasse material into drumlin form. 

 Andrews, Edmund, The North American lakes considered as chronometers of postglacial time: Trans. Chicago Acad. 

 Sci., vol. 2, 1870, 23 pp., with map of Chicago area. 

 Estimates time by rate of sand accumulation and by cutting back of the shore. 



Glacial markings of unusual forms in the Laurentian hills (north of Lake Huron): Am. Jour. Sci., 3d ser., vol. 



26, 1883, pp. 99-105. Also in Bull. Chicago Acad. Sci., vol. 1, 1883, pp. 3-9. 

 Ashley, G. H., and Blatchley, W. S. See Blatchley and Ashley. 

 Atwood, W. W., and Goldthwait, J. W. See Goldthwait and Atwood. 

 Bannister, H. M., Report on Cook County, 111.: Geology of Illinois, vol. 3, 1868, pp. 240-244. 



Discusses the Chicago outlet at the head of Lake Michigan and the beaches connected with it. 



The drift and geologic time: Jour. Geology, vol. 5, 1897, pp. 730-743. 



Duration of glaciation is estimated from the distance erratics were transported. 

 Beachler, C. S., Erosion of small basins in northwestern Indiana: Am. Geologist, vol. 12, 1893, pp. 51-53. 

 Describes glacial deposits laid down in a preglacial valley. 



An abandoned Pleistocene river channel in eastern Indiana: Jour. Geology, vol. 2, 1894, pp. 62-65, with map. 



Describes a channel excavated in till. 

 Bell, Robert, Superficial geology of Canada: Logan's Geology of Canada, 1863, pp. 887-930. 

 Summarizes results obtained to date of paper. 

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