PHYSICAL GEOGRAPHY OF THE COUNTY. F a . 7 



ton's run, (a southern branch of Sherman's creek,) 3 miles 

 southeast of New Germantown, and near the eastern town- 

 ship line. Most of this township is very mountainous and 

 wild. 



Mountains and Hills. 



Five separate ranges of mountains traverse parts of the 

 county, and three distinct ranges of lower hills. 



Three of the five mountain ranges are of one geological 

 character and physical form. The other two have a differ- 

 ent form, and are of a different age and constitution, but, 

 although separate in Perry count}', are alike, and actually 

 unite to form one range in Dauphin county. 



One of the three hill-ranges zigzags continually to and fro 

 throughout the county. The other two are of a different 

 shape and age, but like each other form two great loops 

 across the eastern half of the county ; and the inner legs of 

 these loops unite in Dauphin county. 



The colored geological map which accompanies this re- 

 port expresses very clearly to the eye the courses of these 

 ranges, both of the mountains and of the hills, each range 

 keeping strictly within its own belt of color, and being broken 

 for the most part only by water-courses. 



Mountains of No. IV {Medina and Oneida.)* 



(1.) East Tuscarora mountain forms one range by itself ; 

 and along its crest, for a distance of twenty-one milesf runs 

 the northwestern county line. It is almost perfectly straight 

 and continuous, except that it is gashed by a ravine op- 

 posite Ickesburg.^: The little stream which flows down 

 this ravine drains a small cove or vale in the heart of the 

 mountain, 3 miles long by half a mile wide and pointed at, 

 both ends. The mountain is therefore double for a short dis- 

 tance, having two crests, along the southern one of which 

 runs the county line, the other crest traversing Juniata 



* See these mountains on page plate I. 



t The total length of the mountain, measured by its crest, is about 24 miles. 



\ 14 miles from its east end at the Juniata river. 



