Lo 
W. J. McGee—Superposition of Glacial Drift. 303 
The ice here moved S. 20° or 80° E., and must have been of 
y- 
obliquely the steep slope of the bluff. A ground and striated 
specimen of Orthis Vanuxemz, and an O. Jowensis with a 
to justify may be briefly stated: (1) That residuary 
assumption that residuary clays may sometimes be smooth 
and furrowed 
Farley, Iowa, July 30, 1879. 
* See Lyell, “ Student's Elements,” 1872, p. 179, and Antiq. Man, 1873, p. 262; 
Croll, “Climate and Time,” Am. Ed., p. 465; Geiki . Ed 
Pp. 144-5; Chamberlin, Geol. Wis, 1877, vol: ii, p. 219; Foster and Whitney, 
l. Lake Superior Dist., 1851, pt. ii, p. 245; Logan, Geol. .. 1863, pp. 898, 
902, 906; ‘ é xviii, 
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Reid, Geol. Mag., vol. vi., p. 
Hinde, Canadian Journal, April, 1877; McGee, Proc. Am. Assoc., 1878 
4 é w, 1863, vol. i, pt. ii, p. 68, and 
Drift of Scotland,” p. 67; Read, Geol. Ohio, 1878, vol. ili, pt. i, p. 312; 
serbia cit. (striated pavements also occur near Toronto and are here de- 
Ean ee ee cited by Logan, loe. cit., p. 919; Reid, loc. cit.; Chambers’, 
n. New Phil. Jour., vol. liv, p. 272; and Smith, “Newer Pliocene Geology,” 
p. 129. The last two authorities are cited by Croll, loc. cit. p.256. 
