1 88 G. H. SQUIER 



ceasing until we have passed the bottom of the nearest ravine 

 (d, Fig. 6). When it occurs on both sides of a buttress, and 

 there is but a single intermediate ravine, it extends in some 

 degree over all parts. The maximum thickness of these accumu 

 lations is nowhere shown in section. Such indications as I have 

 noted lead me to the belief that it will probably not exceed six 

 feet or seven feet, thinning off until it is represented by scat- 

 tered bowlders only. There is often an appearance as though 

 the material had been thrown into subordinate ridges of low 

 relief. They are too faint, however, to be relied upon as evi- 

 dence, unless their reality can be confirmed by sections. The 

 fragments range from massive or tabular forms several feet 

 across down through all grades, and they lie as close together as 

 the fragments in a macadamized road. The slopes from the 

 circs to the bounding buttresses are nearly always steep (35° to 

 40 ) . That overlooking the circ b (Fig. 6) is vertical for heights 

 varying from twenty to fifty feet. The small valley shown at 

 a, Fig. 4 has somewhat the character of a circ. The sharp ridge 

 which forms its western rim, or buttress, has a train of limestone 

 debris for the greater part of its length, sometimes rather strag- 

 gling, but quite abundant on its knoblike outer end, and the 

 terminal slope, at the bottom of which it connects with the ridge 

 shown in Sec. 5, Fig. 2 (previous article). 



The larger valleys. — Of the occurrences in the larger valleys 

 two examples are here sketched. The first, Fig. 5, is found in 

 the largest of the valleys (the third described in previous arti- 

 cle). The highest portion of its rim lies toward the northeast 

 (compare Fig. 4), and a portion of this, a peak of triangular 

 form, is shown in the figure. The northwest-southwest portion 

 is a part of the valley rim, while the spur, a, projects into the 

 valley. The top of this spur is thickly covered with limestone 

 debris, save the inner end, and the slope of the main bluff up to 

 the base of the limestone, where it is lacking. Whether the 

 deposit on the spur is continued eastward and southward into 

 the valley cannot be told on account of the loess. The second 

 example, shown in Fig. 7, occurs in the easternmost of the two 



