86 TJie American Geologist. February, is98 
and gravel and the overlying till, I can do no better than to 
refer to my paper in the last number of this magazine, and to 
my description there cited of the occurrence of abundant 
stratified deposits under till in the basin of Lake Winnipesau- 
kee in New Hampshire.* On Moel Tryfan free drainage 
carried away the clay and fine silt that were supplied to the 
waters of the glacial melting, and these waters appear to m€ to 
have deposited subglacially the shell-bearing gravel and sand, 
while the almost contemporaneous till was allowed to fall 
from its previously englacial and superglacial position when 
the ice was fully melted away. 
The contour and surface deposits of this hill have no feat- 
ures which I can regard as suggestive of shore lines or of 
marine deposition or erosion. 
COTE SANS DESSEIN AND GRAND TOWER. 
By C. F. Marbut, Columbia, Mo. 
(Plate X.) 
Cote Sans Dessein is a narrow isolated ridge of paleozoic 
rocks rising steeply from the level of the flood plain of the 
Missouri river in the southeastern part of Callaway county, 
Missouri. It is about a mile long, 200 feet wide and rises 100 
feet above the level of the flood-plain. The latter, at this place, 
is about two miles wide, and Cote Sans Dessein stands about 
midway between the northern and southern bluflfs. 
It is made up of horizontal beds of magnesian limestone, 
identical in age, structure and lithologic character with those 
outcropping in the blufifs on both sides of the flood-plain in 
the vicinity. The Missouri river now flows between Cote Sans 
Dessein and the, southern border of the floodplain and has 
occupied this position continuously since the occupation of 
the region by white men; but the broad belt of typical flood- 
plain lying to the north of the hill is positive evidence that 
the river has recently occupied that belt. 
Grand Tower is another hill whose relations to the flood- 
plain of the Mississippi river are apparently the same as those 
*Am. Geologist, XX, 383-387, Dec, 1897. Geol. of N. H., Vol. Ill, 
1878, pp. 131-137. 
