90 



Lesley.] ■^^ [Jan. 2 and Feb. 9, 



careful future surveys. The adjustment affects the whole southeast 

 corner of the map, viz. : the interval between the mouth of Warrior's Run 

 and the river. It is none of it accurate. The rest of the map is very 

 accurate and reliable. 



Various former surveys of the Juniata were compared in plotting Mr. 

 Piatt's survey along the Pennsylvania Railroad, and all were found to be 

 discordant in details, but the topographical features of the deeply eroded 

 bed of the Little Juniata are porti-ayed with sufficient precision. 



Time failed for a careful survey of the mouths of Canoe and Sinking 

 Valleys south of the river, I leave these and the interesting synclinal 

 mountain (Canoe Mountain) which separates them, for a future oppor- 

 tunity. Canoe Valley leads south into Morrison's Cove, a reconnoissance 

 survey of which I made some years ago for the Pennsylvania R. R, Co., 

 to determine the economical value and geological attitude of its brown 

 hematite iron ores, the analogues of those to be described in this report. 



Three sets of anex'oid levels were carried to the top of the Bald Eagle 

 Mountain, and two of these were continued to its western base, along 

 which flows the Big and Little Bald Eagle Creeks, and runs the Bald 

 Eagle (Tyrone, Bellefonte and Lockhaven) Railroad. A much more care- 

 ful study of Bald Eagle Mountain than of Tussey Mountain had to be 

 made ; first, on account of the Great (Bellefonte or Tyrone Forge) Fault 

 which runs along its east foot; secondly, on account of the vertical attitude 

 of its rocks and the very irregular erosion to which it has therefore 

 yielded ; thirdly, on account of a deflection of trend, due to the little 

 synclinal crimple shown in two of the Cross Sections ; and fourthly, on 

 account of the outcrops of fossil ore on its western slope. Yet, I should be 

 glad to make a complete hypsometric projection of this very interesting 

 mountain, with its dentated double crest, for scientific purposes. Its 

 character is, however, well portrayed in my map and will tell the whole 

 story to any geologist. 



A second map (also reduced by photolithography from its original scale 

 of 100 perches to the inch,) is appended to this report. It is a copy, cor- 

 rected to date, of the land line map* of Lyon, Shorb & Co.'s ore and other 

 lands in Huntingdon, Blair and Centre Counties, covering about 200,000 

 acres in the valley and on its two bounding mountains, and stretching 

 westward beyond the Bald Eagle Creek to the coal measures on the crest 

 of the Alleghany Mountain. It was impossible to transfer the numerous 

 and complicated land lines of this map to my topographical map without 

 concealing its features beneath a net work of irrelevant indications. I have 

 gone even farther in my anxiety to show with unobstructed clearness 

 the geology by the topography ; I have abstained from introducing local 

 names upon my map, trusting to the intelligei)ce of those who consult it, 

 guided by a small key map in its southeast corner, and by the descriptions 

 I give of localities with reference to the numerous ore banks which are 

 numbered. The key to the numbers will be found in the northeast corner 



* TJje original is in the office of Mr. Lowrie, at Warrior's Creek, Huntingdon Co., Pa. 



