THE ADIRONDACK GRAPHITE DEPOSITS IOI 



by a bed of limestone which is correlated with the erumbly lime- 

 stone which we met with on the Faxon property. Continuing 

 southward, ignoring the numerous pegmatites, a biotitic rock was 

 found that has been unsatisfactorily interpreted. Some of it is 

 clearly a contact rock consisting of titanaugite and biotite, while 

 other specimens are quartz-augite rocks with chondrodite ( ?) ; still 

 others look like the Hague gneiss, but its presence here would be 

 difficult to explain unless there has been a repetition of the beds by 

 faulting or that this limestone is the Faxon rather than the crumbly 

 member. The limestone is again found near the base of the hill, 

 probably repeated by isoclinal folding. 



In this limestone occur two prospect pits of bygone days. One 

 of them was of the nature of a drift driven into the hillside in a 

 crush zone, along which pegmatitic solutions have given rise to a 

 limited amount of the contact type of graphite. At a later geologic 

 period a narrow disabase dike 34 inches wide, N 6o° E, has followed 

 the same line of weakness. 



The second pit is located a little distance farther up the slope 

 and a little to the west. Here a trench was made in serpentized 

 limestone that is today verde antique marble. This is in contact 

 with a mass of the perplexing " biotitic rock." One of the pegma- 

 tites above mentioned has cut the limestone and developed a good 

 display of the spectacular contact type of graphite. The third pit is 

 a square shaft sunk some 10 to 12 feet in barren pegmatite. 



Outcrops are lacking immediately north of the mine; the nearest 

 exposures occur perhaps three-eighths of a mile distant on the farm 

 owned by Nathan Towne. The typical Hague gneiss dipping 20 ° 

 S o° E was found cut by numerable pegmatite dikes, which in one 

 place have developed graphite by contact action. Beyond a gap of 

 20 feet is an exposure of the typical Catamount schist, so similar to 

 the rock from the Bear Pond mountain region that hand specimens 

 of the two are indistinguishable. The Catamount here dips 51 ° S 

 2° E. In the glacially filled depression between the two rocks Mr 

 Towne dug up for us a few pieces of graphitic schist. It would 

 seem to us that that ore was a transported boulder, not in place. 



Continuing northward the thick Swede Pond quartzite was 

 encountered. The writer followed the road, passed over a gap and 

 found the quartzite again forming a precipitous cliff. The Swede 

 Pond here was a beautiful semitransparent to translucent pinkish 

 buff rock, dipping 50 magnetic south. Beyond, the Catamount 

 reappears. The interpretation that the writer would put upon these 



