24 F 2 . REPORT OF PROGRESS. E. W. CLAYPOLE. 



is evidently due in part to the ridge below Newport, and 

 to the effort of the drainage waters to get round its eastern 

 end. 



Sherman 9 8 creek plays the principal role in the drainage 

 of Perry county, and is wholly -confined to the county ; 

 heading in its westernmost township (Toboyne,) and flow- 

 ing eastward through Jackson, Madison, Tyrone, Spring, 

 Carroll, and Wheat-field to the Susquehanna river at Dun- 

 cannon, two miles below the mouth of the Juniata river. 



In its exceedingly tortuous course past the villages Fair- 

 view, New Grermantown, Mt. Pleasant, Beavertown, Cen- 

 tre, Landisburg, Bridgeport, Shermansdale, and Delville, it 

 receives a hundred smaller streams, of which the principal 

 are Brown's run, Houston's rim, Laurel run, and McCabe's 

 run, descending from the western mountain spurs, and An- 

 derson's and Montour's runs coming in from the north, 

 the one past Andersonburg and the other past Elliotts- 

 burg. 



Sherman's creek illustrates the geology of Perry county 

 in two ways : 



First, It occupies itself solely and wholly with collecting 

 and transporting eastward the rainwater which falls upon 

 the area lying to the south and west of the blue limestone 

 zigzags. 



A mile below Bridgeport, it breaks through the Limestone 

 ridge, and flows forward (still eastward) across the brown 

 into the pink belt, and along the north face of the North 

 Cove or Peters' mountain to the Susquehanna. 



Why, when it had reached Shermansdale, it did not adopt 

 lor its channel the straight and narrow valley lying open 

 before it, between the Cove and Blue mountains (past 

 Grierspoint, Keystone, and Fenwick) instead of receiving a 

 branch from that direction, and itself turning back to take 

 a longer, crookeder, and more round-about northerly way to 

 its destination, will be explained when the local geology of 

 Carroll township is described. 



Bui why Sherman's creek makes its bold curve from 

 Fairview to Bridgeport is perfectly well explained by the 

 coloring on the map, where the stream is seen cutting 



