PHYSICAL GEOGRAPHY OF THE COUNTY. F 2 . 13 



ing the Susquehanna river) where the sandstone first and 

 then the limestone ceases to exist, and the hill range neces- 

 sarily disappears. 



The map will show, also, that the zigzags of this hill-range 

 (of the first class) correspond to or point towards the zigzags 

 of the first, second, and third mountain ranges already de- 

 scribed ; and it will be shown in a subsequent chapter that 

 the same geological causes operate to bring the two sets of 

 zigzags into existence and into mutual concordance. 



In describing the No. VI- VII range, it will be convenient 

 to divide it into seven sections or courses, beginning at the 

 north. 



The first section, 8 miles long and perfectly straight 

 and unbroken, forms the northern boundary of the county 

 between the Juniata and Susquehanna rivers. The lime- 

 stone faces the south. It is gapped by Cocalamus creek and 

 another smaller stream. 



The second section, 36 miles long, extends nearly the 

 whole length of the county. It unites with the first section 

 in a sharp point 2 miles west of the Susquehanna river ; is 

 straight for 8 miles to the Juniata river at Millerstown, with 

 three gaps ; then 5 miles further to Donnally's mills, where 

 it is gapped by the south branch of Raccoon creek ; and 

 then 8 miles further (with another slight gap) as far as Ickes- 

 burg. Limestone always facing north. * 



Here the limestone ends, or rather zigzags back three 

 times. The sandstone begins to zigzag southward at a point 

 2 miles before reaching Ickesburg. 



From a point 3 miles east of Ickesburg to New German- 

 town (15 miles) the course is straight, (with one zigzag half- 

 way.) At New Germantown the limestone ends in a point. 

 The sandstone points out 6 miles before reaching Now Ger- 

 mantown, /. e., opposite Andersonburg. 



The third section, more than 30 miles long, measuring 

 from New Germantown to the Juniata river below Baileys- 



*It should be mentioned that though the range is here spoken of as a hill, 

 yet along this part of its course almost no elevation can be seen, and conse- 

 quently the "gaps'' are quite insignificant. 



