Lesley.! O-i [Jan. 2 and Feb. 6, 



The Pennington ore rocks descend into and beneath Logan's Creek 

 Valley, at first slowly, then steeply, at last vertically, and before reaching 

 the surface again on the other side of the little synclinalj are cut off by 

 the great fault, and are sent down by it to a depth of many thousand 

 feet beneath Bald Eagle Mountain. 



On section line C D, fig. 3, no such structure appeal's ; consequently 

 the little Logan's Creek synclinal does not range away northeastward 

 along the foot, but cuts across more northward into the flank of Bald 

 Eagle Mountain.* 



As for the Pennington Ridge anticlinal, it loses itself in the hill north 

 of Warrior Mark Village, and in the great fault further on. Obscure 

 dipsf of 750 to 8OO (N. W.) are seen in calc. sandstone at 500 yards north- 

 west of the village, and 80° (N. W.) in blue limestone, at 450 yards 

 further up Warrior Run ; but the universal slant in the country, from 

 hei-e onwards, is southeast ; all the outcrops beyond or northeastward of 

 Warrior Mark Village belong to the southeast side of Pennington Ridge. % 

 The Pennington Bank ore range is therefore a short one, whereas the 

 juext ore-range to the south of it runs continuously through Warrior 

 ^Mark Village and Love Town for ten miles within the limits of our 

 ;Map. 



The Pennington ore rocks are also of an older age than those of many 

 other banks in the Valley, as the sections show. They belong rather to 

 .the lower than to the middle division of the Great Limestone Formation. 

 The Pennsylvania, Hostler, and other banks on the Spruce Creek side 

 belong to the middle division. Any constant diff'erence of qiiality ob- 

 servable between the ores is of course to be ascribed principally to this 

 > fact, viz. : that the ore bearing rocks being deposited in two successive 

 .ages, and therefore under different conditions, their present dissolubility 

 -and receptivity (as regards soluble salts of phosphorus, sulphur, &c.}, 

 . have bestowed on them peculiarities of individual character. 



I consider it possib e that the Pennington Range corresponds in age 

 with the Bloomfield ore range, in Morrison's Cove, thirty miles to the 

 south. 



The Pennington Range proper consists of a line of outcrops commenc- 

 ing about two miles from the Juniata River, and extending two miles to 

 the railroad, a mile west of Warrior's Mark Village. The northwest face 

 of Pennington Ridge is covered with wash-ore to a variable depth, below 

 wliich lie sheets, belts, and masses of rock ore, between ribs of still un- 

 dissolved siliceous limerock. The more argillaceous lime beds have left 

 intercalated sheets of white clay. 



* The Map shows how it swings the mountain a little out of its otherwise straight 

 course, and also how Logan's Creek takes its head just where its synclinal terminates in 

 the mountain slope. 



t The cross cleavage of the rocks near the fault makes the direction and strength ol 

 these dips doubtful. They look like 30° to 60° (S. E.) 



X As -will be abundantly evident to any one travelling along the road from Warrior 

 Mark to Love Town. 



