LETTER OF TRANSMITTAL. 



To His Excellency Robert E, PattisojS", ex-officio Chair- 

 man of the Board of Commissioners of the Second Geo- 

 logical Survey of Pennsylvania : 



Sir : I have the honor to transmit the first report of Prof. 

 E. W. Claypole on Perry county, relating chiefly to its 

 structural geology. The description of fossils and the dis- 

 cussion of purely palseontological subjects are reserved for 

 another report. 



The first ^n^ chapters I have edited and condensed, add- 

 ing sundry geographical items to the first chapter. Prof. 

 Claypole has read the proof of the printed text from page 

 113 onward. The Index I have myself compiled. 



Two colored geological maps of Perry county accompany 

 this report. One prepared by me in 1878, from the MS. 

 maps and field notes of Mr. John H. Dewees, and from the 

 State map of 1841-2 (1858); the other by Prof. Claypole 

 in 1883. The one ascribed to Mr. Dewees was drawn on 

 stone and printed in 1879 by Bien & Co., and has ever since 

 awaited the publication of Mr. Dewees' reports on Perry 

 and Juniata counties — a publication delayed by various 

 causes not needful to specify. This map may be more cor- 

 rect along the lines of fossil ore outcrop to which Mr. De- 

 wees paid special attention, but is wholly incorrect along 

 the Dick's ridge, Mahony ridge and Half-Falls mountain 

 belt (the central belt of Perry county) so carefully studied 

 and portrayed by Prof. Claypole. 



The author's township outcrop maps are reproduced 

 from the originals without change. No separate geological 

 maps were made of Jackson, Madison and Toboyne town 

 ships on account of their mountainous and wild condition 

 and lack of reliable geographical data. 



(v F2.) 



