14 F\ REPORT OF PROGRESS. E. W. CLAYPOLE. 



burg, is known along its whole length by the local name of 

 the Limestone ridge. 



Ir is 2£ miles broad north of Andersonburg and Centre, 

 and between Centre and Sandy hill, where its belt of sand- 

 stone zigzags sharply several times. 



For the next 14 miles it is a narrow, straight, and un- 

 broken ridge. Zigzags twice opposite Bloomfield, and then 

 runs on again, straight and unbroken, 8 miles further to the 

 Juniata. 



From a mile west of Bloomfield to the Juniata, a distance 

 of 9 miles, the ridge has a double or triple crest of sand- 

 stone, inclosing a narrow stripe of limestone. In all other 

 parts of its course the limestone forms its south face. 



The four Hi section, 16 miles long, returns sharply on the 

 third, and close to it, from the Juniata river, past Bloomfield 

 and Elliottsburg to Green Park, where the limestone (always 

 facing north) points out. There are four gaps through it 

 in Centre and Miller townships, but along a great part of its 

 course there is no ridge, the ground is quite low, and the 

 sandstone is rarely visible. 



Four zigzags occupy the area (2i miles wide from north 

 to south) between Green Park and Landisburg, and there is 

 a water gap through the first one a mile south of Elliotts- 

 burg. 



The fifth section, 13 miles long, returns east for about 8 

 miles, and is known locally as Iron ridge. It is there cut 

 out by the Perry county fault. The ridge is gapped by 

 Richland run at the Perry furnace. A small outlier of sand- 

 stone and limestone occurs at Montebello narrows, 3 miles 

 further east, brought up by the fault. 



The sixth section, 10 miles long, with two sharp zigzags, is 

 four times gapped, once by Sherman's creek a mile north- 

 east of Oakgrove, where the ridge ends. Limestone always 

 facing north. 



The seventh section runs along the base of the Blue mount- 

 ain, the limestone facing south. The sandstone and lime- 

 stone grow less and less for 10 or 1 % 2 miles east of Oakgrove ; 

 and the ridge ceases to exist near Sterretfs gap. 



