216 
IOWA ACADEMY OF SCIENCES. 
2, and also in plate xxii. This came to light by stripping 
in the Loftus quarry. The striated surface thus exposed 
was large, and was especially interesting because it showed 
both floor and lateral erosion; and also because the surface 
rose in benches. The markings of the floor surfaces were the 
same as that described from Kingston — continuous, parallel, 
straight grooves. But the lateral scoring, which showed on the 
rise from one bench to another, consisted of a multitude of fine 
scratches, which were not parallel, but crossed one another at 
small angles. Where the angle of the bench had become much 
worn away it exhibited a tendency to grooving. The lateral 
surface also showed gouging where the rock was softer, while 
the floor surface did not. The direction of the striae was south 
75° east, which is also the trend of the bluff, which here borders 
the valley of a small stream. There was only one series of 
striae, so the test of intersecting grooves cannot be applied to 
show in which direction the ice stream was moving. The lateral 
erosion indicates that the movement was towards the southeast; 
for, wherever a projection occurs, the shoulder toward the 
northwest is cut away to a much greater degree than the one to 
the southeast. 
Recently three other areas of glacial scoring have been located. 
Two of these are in the vicinity of Starrs Cave, four miles north- 
west of Burlington. They are at the very summit of a project- 
ing mural escarpment, 100 feet above the bed of Flint creek. 
They are not more than forty rods apart, yet one shows a direc- 
tion of south 33° east and the other south 73° east. These 
