IOWA ACADEMY OP SCIENCES. 
217 
angles were taken with a compass and corrected 7° for devia- 
tion. The trend of the bluff is in a curve, which, together with 
the di;fference in angle, brings the first mentioned scratches par- 
allel, and the latter at right angles to the escarpment. The 
two surfaces are on about the same level. They are somewhat 
weather-worn, so that all the fine striations are gone; but the 
larger grooves show very distinctly. The locality is about two 
miles from the bluff bordering the Mississippi flood plain. 
The other place is about half a mile distant from the one pre- 
viously described from near Kingston. To distinguish between 
them, they have been designated as Kingston No. 1 and King- 
ston No. 2. This later discovery is on the brow of the bluff, 
and extends from the top some distance down the face. The 
bluff is rounded off, and descends at an angle of about 30°. It 
has no covering of loess, or drift and is but scantily concealed by 
occasional patches of soil. The scorings range over a consid- 
erable area, not continuously, but in numerous places. No fine 
striations show, for the rock is much weather-worn; but the 
larger grooves are very plain and distinct. These appear at 
intervals from the summit of the bluff some distance down the 
face. The direction was not taken with a compass, but is approx- 
imately south 70° to 75° east, which corresponds to the latest 
series of Kingston No. 1. The scorings at this place would 
seem to bring additional evidence that the ice movement was 
eastward. The bluff faces east and rises at an angle of about 
30 ° ; and while it is conceded that a glacier ma^T- move up a mod- 
erate incline, yet it is doubtful if there would be motion on the 
under surface, where the rise is as much as above given. 
As already stated, there have been several well-authenticated 
discoveries of glacial scorings within the city of Burlington. 
The finds have always been on the verge of the escarpment 
crowning the North Hill bluff. Exposures at this place are not 
likely to remain any length of time, for, either the loess slides 
down and covers them, or else a portion of the ledge breaks 
away. Recently a very careful investigation of the bluff was 
made from the north end of the city to a distance three miles 
below, and the only piece of rock scoring found was on a 
detached block which had been previously pointed out by Mr. 
Frank Leverett, who reported that he had seen it in place not 
more than three or four years ago. 
