Lesley.] iUO [Jan. 2 and Feb. 6, 



occurs at Frankstown bed b, so thick as to be called tJiere the main bed. 

 A hundred feet above the triple bed c, d, at Frankstown is still another 

 layer a few inches thick. 



It is ioaportant to note the order in which these deposits occur to the 

 explorer descending the mountain side from the outcrop of the hard 

 fossil ore, because it is very evident, that the occasional openings made 

 along the range on one or other of the three principal soft fossil ore out- 

 crops, viz. b; — c, d; — e; — are very misleading. The Bald Eagle Moun- 

 tain was for many years condemned by geologists as destitute of workable 

 fossil ore, because the number of beds was not known ; no comparison 

 of localities was made ; no complete section down the mountain slope, at 

 any one place. Since the different beds vary in thickness constantly 

 and rapidly, and apparently under a law which may be rudely stated 

 thus : when one bed thickens it is at the expense of the others, as if there 

 was but a certain quantity of iron at command and sometimes one bed 

 would get more than its share, and sometimes another, — it follows that 

 the value of any tract on the mountain side can be determined only after 

 a thorough trial of all three (five) outcrops of soft fossil ore has been 

 made ; and in no instance has this been done, in the range of 10^ miles 

 upon the Lyon, Shorb & Co. 's lands, nor between them and Frankstown, 

 nor east of them. 



Every road decending the west face of the mountain exposes one or 

 more of these outcrops ; the highest (lowest geologically) being always 

 50 or 60 yards below the hard fossil outcrop, where the sandstones of the 

 crest commence. 



The red sandstones of the crest and first steep pitch of mountain side 

 between the crest and the hard fossil outcrop, send a multitude of frag- 

 ments down over the soft yellow and red shales forming the middle slope 

 of the mountain, and under th«se the soft fossil outcrops lie concealed. 

 The gentle foot-slopes of the mountain are occupied by limestones, 

 marls and red shales. 



One of the soft fossil beds has been opened 1,300 yards northeast of 

 Tyrone city, as shown on the Brush Mountain map accompanying this 

 report, at an elevation of 370 feet above Railroad grade. A limestone 

 bed crops out 70 yards down the slope (above it geographically) at 320 

 feet above railroad grade. The ore-bed is opened by a tunnel and "is 18 

 inches thick," including some thin layers of ferriferous fossil limestone. 

 It stands " vertical," or overturned slightly so as to dip into the moun- 

 tain in a direction S. 48° E. 



Nothing is known of the other beds. 



Experience at Danville and Bloomsburg in Eastern Pennsylvania has 

 proved that the soft fossil ore can be extensively mined when only 16 or 

 18 inches thick (on a general average of the workings) as may be seen 

 by reference to the very important chapter written on this subject by 

 Prof. H. D. Rogers at page 440 and onward in the first volume of the 

 Final Report of the Geology of Pennsylvania. Experience at Franks- 



