y6 The American Geologist. February, i904. 
long time, until lately it has been cleaned again, when it began 
to show the same strong flow, the head of which is at constant 
level of four feet below the surface. 
Also in sec! 2 of Perry township within T.ioo, R.50W. and 
in sec. 7 of La Valley township the sands of the drift are near 
the surface, the sands being struck in the former locality at a 
depth of only 16 feet, the water at 20 feet, while in the latter 
locality the sand was met with four feet from surface, the 
water 22 feet below. 
In the southern part of the region, for instance at Beresford, 
gravels and fine sands are revealed by borings at a depth of 44 
feet, at Centerville sands at a depth of about 100 feet, wdiile at 
the former locality the water was struck 84 feet and at the 
latter 108 feet below surface. At and in the vicinity of Worth- 
ing sands were revealed, intermixed with "hard shells," at a 
depth of 87 feet, while the water was found near the base of 
the layer about 97 feet below the surface. 
Not all of the sand and gravel stratum seems to carry water, 
but that there must be a constant flow in certain directions with- 
in the stratum, seems to be evident from the data given above, 
but especially from the peculiar condition found in section. 34, 
S.W. quarter, of Delapre township. 
At many points the sands and gravels come to the surface, 
along the margin of ancient basins in the inner slope of the Al- 
tamont moraine and south of it, viz. : in the neighborhood of 
ancient channels of glacial or Champlain age ; in sags and other 
outlets not only of the northern watershed, but also in the 
"Canton ndge" and to some extent along the watercourses of 
the region on Nine Mile creek, Beaver creek. Long creek and in 
the banks of the Big Sioux ; also on the western tributaries of 
Pattee creek as well as on the main stream. Gravels are also 
reported from southwest of Beresford. 
The study of the composition of this sand-and-gravel strat- 
um is of great interest in so far, as the different layers of fine 
and coarser gravels and sands, indicate different phases in the 
development of the drift. Several sections obtained by the 
writer from different localities, may serve to illustrate the ar- 
rangement of the lavers. 
