PLATE 13. 
Figure 1— Banpep Suiate at Squantum SourHaast. 
At the most southeasterly exposure of the slate at Squantum regular banding commences about 
thirty feet above the tillite. The first regular bands have about equal amounts of sandstone and slate. 
The exposure shown here is about 100 feet above the tillite. The sandstone layers have thinned down 
greatly at this point. The regularity of interval is very marked. 
Figure 2.— Recutar Banps of SANDSTONE AND Siar, Squantum SourHEast. 
This figure shows regular banding. The specimen was collected from a horizon about twenty feet 
lower down in the formation than the slate shown in Figure 1. The sandstone layers are slightly thicker 
than in the above view, and much thinner than in the bands first showing regularity of interval about 
thirty feet above the tillite. 
qt 
