ABSTRACT OF VOLUME. 



This monograph describes the glacial features and the great glacial lakes of a district in 

 Indiana and Michigan lying between the areas covered by Monographs XXXVIII 1 and XLI. 2 

 The glacial features are treated mainly by Mr. Leverett, and the glacial lakes and then- moraines 

 by Mr. Taylor. The pre-Wisconsin glacial and interglacial formations aregiven attention, but the 

 principal subject of discussion is the Wisconsin drift of the Saginaw lobe and the neighboring 

 portions of the Lake Michigan and Huron-Erie lobes. 



Chapter I. Introduction. — The drift sheets and intervals are outlined and the time 

 divisions of stage and substage are explained. A bibliography of about 400 papers by nearly 

 150 different authors dealing with the region of the Great Lakes and the area southward to the 

 Ohio is given. 



Chapter II. Physical features. — The altitude and relief, the principal topographic 

 features, the drift topography, the drainage systems, and the thickness of drift are briefly 

 treated. The region is one of only moderate relief and the altitude nowhere reaches 2,000 

 feet. Small areas in the basins of Lakes Michigan and Huron are below sea level. 



Chapter III. Pre-Wisconsin drift and associated deposits. — The limits of glacia- 

 tion in Indiana and Kentucky are outlined. The cpiestion of pre-IUinoian drift is discussed 

 but no conclusion is reached. The topography, structure, and rock constituents, and other 

 deposits of the pre-Wisconsin drift are briefly discussed. The stria? outside the Wisconsin 

 drift are tabulated. The Sangamon soil and the post-Sangamon or main loess are briefly 

 discussed. 



Chapter IV. The Wisconsin drift border. — The edge of the Wisconsin drift and its 

 characteristics are the main theme, but the existence of an earlier and a later Wisconsin drift 

 and the grouping of moraines are treated briefly. 



Chapter V. Correlatives of the Champaign morainic system. — The correlation of the 

 Champaign moraines differs somewhat from that given in Monograph XXXVIII; moraines 

 which were there said to override the Champaign system in western Indiana are now con- 

 sidered to be probable correlatives of that system. 



Chapter VI. Correlatives of the Bloomington morainic system. — The Bloomington 

 morainic system of the Lake Michigan lobe is interpreted as finding its continuation across 

 Indiana in a great belt of thick drift which runs eastward from Benton and Warren counties, 

 with a slight bowing to the southward in central Indiana, and which enters Ohio from Ran- 

 dolph and Wayne counties. It is continued in Ohio as the "Main morainic system" discussed 

 in Monograph XLI. 



Chapter VII. The Saginaw lobe. — The change from undifferentiated drift to definite 

 lobes is interpreted as having been caused by a great recession of the border in the district east 

 of the Lake Michigan lobe in northern Indiana and southern Michigan. Several moraines lying 

 in this area of recession are discussed. 



Chapter VIII. Moraines of the northern limb of the Huron-Erie lobe in Indi- 

 ana. — A complex morainic system is described as running northeastward from near Delphi, 

 Ind., to the northeast corner of the State. It is interpreted as the correlative of several moraines 

 that He between it and the Lake Michigan lobe. 



i Leverett, Frank, The Illinois glacial lobe: Mon. U. S. Geol. Survey, vol. 38, 1899. 



2 Leverett, Frank, Glacial formations and drainage features of the Erie and Ohio basins: Mon. U. S. Geol. Survey, vol. 41, 1902. 



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