42 The American Geuhxjisi. July, 1895 
Toi'OCiKAI'IlV, 
The eastern portion of the range consists of a series of 
overlapping ridges or eU)ngated mounds having their longer 
diameters parallel in general with the trend of the range. 
Only at the "Pinnacle" is the cross-section a single ridge, and 
this part is better described as an elongated, irregular mound. 
The width of the belt at Cobb's hill is but little less than one- 
half mile, and here the crests of the northern and southern 
series of ridges or mounds are about one-fourth mile apart. 
At South Goodman street the two series of ridges are one- 
eighth of a mile apart. The western third of the range, or 
the portion beyond South Goodman street, is very different, 
being, instead of east-west ridges, a broader, irregular aggre- 
gation of mounds with a larger number of enclosed basins. 
The crest line is very irregular, nowhere level for any dis- 
tance, varying 100 to 180 feet in hight between the groups of 
hills. The northern slopes of the range are irregular, with 
spurs and hillocks and deep ravines, and over the eastern half 
of the range are usually as steep as the material will rest, 25 
to 30 degrees. The southern slopes are more smooth and uni- 
form, commonly with gentle inclination to the southern ]>lain 
into which they blend. 
The irregularity of the hills is great in both longitudinal 
and transverse sections. The only feature <»f evident system 
is the linear arrangement f)f the series, taken as a whole. 
A striking feature which has not been sufficiently noted is 
the frequent occurrence of "kettle holes"' and basins. A bet- 
ter example of mound and basin t()pf)graph3' might not be 
desired than is found in Mt. Hope cemetcr3^ Beautiful ex- 
amples of kettle holes are seen here; also in the Warner 
tract; also east of South Goodman street, and east of Cobb's 
hill. The only ponds or swamps are found east of South 
Goodman street, where one pond occurs, lying at the base of 
the hills, and one large oval basin has been filled with peat to 
a depth of at least six feet. 
Stkucturk and CoMroSITION. 
The materials composing these hills are so various and with 
such irregular arrangement that a brief description is diffi- 
cult and inadequate. A minor portion is true till, which forms 
a thick sheet over Cobb's hill and probably the very summit 
