412 THE ILLINOIS GLACIAL LOBE. 



composed of sediment which settled in the waters of the bays. The great 

 amount of calcareous material, however, seems to indicate that they are a 

 glacial rather than lacustrine silt. The scarcity of evidence of life in the 

 early stages of the lake seems to indicate that but little calcareous material 

 can be looked for from that source. 



SECTION VI. STRIDE WITH1X LIMITS OF SHEEBYVILXE MORAINE. 



The table of striae given below includes all exposures of which the 

 writer has knowledge either through personal observations or from publica- 

 tions and correspondence. There are several observations taken by Messrs. 

 J. T. Campbell, 0. P. Jenkins, A. H. Purdue, and J. A. Udden, hitherto 

 unpublished, which have been kindly contributed for publication in this 

 report The bearings taken by the writer, except when so designated, are 

 not corrected for magnetic variation. The bearings taken in western 

 Indiana by Collett, Campbell, and Jenkins are corrected for magnetic varia- 

 tion, but so far as known all others are magnetic. The magnetic variation 

 in western Indiana is only about 3° east and in western Illinois 6° east. 1 



Table of atrial within limits of Shelbyville moraine. 



LueatM 



Bearing. Observ 



Near Troutman, Ind I S.8°E ' Collett. 



Coal Creek bluff, 3 miles west of Waynetown j S. 18° E | Collett. 



Coal Creek bluff, 3 miles west of Waynetown a S.20°W Hopkins. 



Near Darlington, Ind i S. 31° E i Leverett. 



Near Darlington, Ind. b S. W Thompson. 



In northern Parke County, sec. 27, T. 17, R. 7 W S. 39° 48' E .... Campbel!. 



In northern Parke County, set-. 27, T. 17, R. 7 W c S.34° 30' E Campbell. 



Williamsport, Ind S.68 c E Leverett. 



Williamsport, Ind. <f ! S.8°-10 c W . .. Salisbury. 



a See Collett, Geol. of Indiana 1875, p. 370. Also Hopkins, Geol. of Indiana, 1895, p. 273. The observations by Mr. 

 Hopkins indicate that the bearing reported by Mr. Collett should be S. 18° "W. 



b The stria- reported by Mr. Maurice Thompson were probably formed by the Erie lobe. 



c Two exposures on the bluff of Sugar Creek, 100 feet apart, show a difference of 5° in bearing. The observer, Capt. 

 J. T. Campbell, of Rockville, Indiana, has reported several exposures of glacial stria? in Parke and Putnam counties, 

 Indiana, which bear southwestward, and accordingly are referred to the Maumee lobe. They are discussed in another 

 report now in preparation. 



ttThe observations reported by Professor Salisbury probably represent a movement connected with the Wisconsin 

 stage of glaeiation, while the observations reported by the writer belong apparently to an earlier glaciation. Two miles 

 east of Williamsport, on the north side of the Wabash, Professor Chamberliu found a third set of striae with westward 

 bearing, which apparently pertain to the invasion of the Erie lobe. (See Seventh Annual Report TJ. S. Geol. Survey, p. 207.) 



'See map of Henry Gannett, showing distribution of magnetic variation in the United States 

 for the year 1900: Seventeenth Ann. Rept. U. S. Geol. Survey, Part I, PI. II. 



