264 Buell—Geology of the Waterloo Quartzite Area. 
glomerate, the rounded pebbles being almost entirely of quartz, 
principally of translucent white and gray, but with some red 
and brown opaque varieties as well. In drift bowlders found in 
the lee of these ledges, pebbles of larger size from two inches in 
diameter downwards are seen. These are chiefly of light colored 
quartz but among them are a few of black magnetitic and gray 
micaceous schists. The abundance and condition of this included 
material indicates an approach at this margin of the area to the 
older formation. In the quarry ledge the discordant stratifica¬ 
tion observed on the face of the section plainly indicates beach 
action This is also made evident by the rapid alternation over 
the same surfaces of finely granular and conglomeratic layers. 
On one of the ledges north of the quarry outcrop this structure 
is finely brought out. Crossing a smoothly planed surface of 
several square rods area are two layers of rather fine conglom¬ 
erate, separated by a stratum of even-textured rock in which 
the layers of cross-stratification are as perfectly preserved as if 
the rock had undergone no metamorphism. 
No conglomerates have been observed in the other areas. The 
finer material in these seems to have been very evenly deposited, 
but the bedding planes are plainly indicated on the ledge sur¬ 
faces by narrow bands of slightly differing colors. The dip 
and strike are easily made out on nearly every ledge of the 
several areas. 
In the northeast exposure of the Mud Lake area the strike is 
N. 80° E., or nearly east and west. The dip is here 45° to 
the south. In the larger western ledge the strike is more 
southerly or N. 55° E., with dip of 55° S. E. In the north 
ledge of the Portland area the strike of the parallel ledge crests 
is N. 30° E. with dip to the S. E. In the ledge next in order 
on section 28, a strike of N. 43° E. occurs, with dip of 42° to 
the S. E. On another surface on the northwest corner of sec¬ 
tion 34 the strike is N. 15° W., with dip of 71° E. In the 
last ledge of this series on the northeast quarter of section 33, 
a strike of N. 30° E. was again noted, with dip of 66° to the 
E. This variation of direction and inclination of strata con¬ 
tinues in the exposed layers of the quarry ledge. On its north 
end the bedding planes at two points furnish a due north strike 
