99 



Lesley.] •^■" [Jan. 2 and Feb. 6, 



of the map. The numbers follow rudely the ore belts, but not on any 

 strictly scientific principle ; they are arranged for the convenience of the 

 reader. 



A third map, heliotyped from a large original study of Brush Moun- 

 tain (Bald Eagle Mountain continued soutliward across the Little Juniata 

 River) is also appended, to show the outcrop of the Fossil Ore on that 

 part of the property which extends in that direction. But the descrip- 

 tion of these Upper Silurian Fossil Ores must be kept separate from my 

 discussion of the Lower Silurian Brown Hematites, or Limonites of the 

 Nittany Valley. 



GENERAL GEOLOGICAL CONSIDEKATIONS. 



The country specially examined in this report covers outcrops of the 

 following geological formations, designated by the numbers of the old 

 Pennsylvania State Survey, and the names given them by English and 

 by New York Geologists. 



No, V. Upper Silurian. \ Clinton Red Shale, 



.,. ( Upper, white, I Medina Sandstone. 

 No, IV. I Middle, red, ) 



( Lower, grey, Oneida Conglomerate. 



No, III, Lower Silurian. \ Hudson River Slate. 



No. IL Lower Silurian. 



Trenton Limestone. 

 Black River Limestone. 

 Birdseye Limestone. 

 Chazy Limestone. 

 Calciferous Sandstone. 



No. I. Lower Silurian. \ Potsdam Sandstone. 



The Iron ore horisons described in this report ai-e as follows : 

 In No. V. The upper or soft fossil ores. 

 The lower or hard fossil ore. 

 In No. II. The first horison at the bottom of the Trenton Limestone : 



Pennsylvania Furnace and Spruce Creek ores, and ores of Cale Hollow. 

 In No. II. The second horison : the whole Dry Hollow Range of ore 



banks, including Huntingdon Furnace and Dorsey Bank. 

 In No. II, The lowest horison, far above the top of the Calciferous : 



the "Warrior's Mark and Lovetown Range and the Pennington Range. 



The dip of the rock, of the whole country exhibited on the map, from 

 the foot of Bald Eagle Mountain to the crest of Tussey, is towards the 

 S, S, E., with one or two undulations of no great moment. This is plainly 

 shown by the three cross sections, figs, 1, 2, 3. 



