106 NEW YORK STATE MUSEUM 



prospect holes show that the schist can be traced a long distance 

 along the strike. 



Geology and structure. The same stratum of quartz schist, 

 which carries the graphite, occurs in the two outcrops in the mine 

 and in the quarry, repeated by faulting. The stratigraphy prevail- 

 ing at both localities is in accord with such a suggestion. Starting 

 " in the bottom of the ravine by the old mill ... a ser- 

 pentinous limestone forms the bed of the brook for some distance." 1 

 The next rock to the north is a para-amphibolite (see left end of 

 section, figure 24), dipping 30 south. If this rock is the Beech 

 Mountain amphibolite it would be reasonable to expect that the 

 sillimanite schist (Catamount schist) should succeed it in passing 

 northward, or stratigraphically downward. This proved not to be 

 the case; the amphibolite grading into the quartzite, which is 

 vitreous but as the crest of the knoll, under which the horizontal 

 drifts are located, is reached it was found to be crumbly and injected 

 and saturated by the old Laurentian granite, producing a syntectic' 

 rock which in a few cases is an augen-gneiss. This probably is the 

 Swede Pond gneiss. The northern slope of the knoll is composed 

 of siliceous limestone — the Faxon. Between the limestone and the 

 quartzite is a lenticular mass of the metagabbro. Beneath the lime- 

 stone is the graphitic schist shot through by " pegmatitic material 

 which forms knots (" nuts ") and stringers . . . probably due 

 to injection from a granite magma." 2 Here 10 to 15 feet of the 

 ore bed is exposed. The tunnels which have besn driven along the 

 course of the beds at points below the outcrop tap the fresher por- 

 tions of the bed. The floor of the inclines exhibits slickensided sur- 

 faces suggesting that a fault, parallel to the bedding, occurs here. 



The writer was unable to observe the footwall rock, which would 

 normally be the Hague gneiss or its equivalent. A swamp beyond 

 compels the writer to put a gap in the cross section. Almost any- 

 thing may have happened in this interval, in view of the faulting 

 that characterizes this locality. Pegmatite, quartzite and meta- 

 gabbro are the rocks next encountered. That the last is not a para- 

 amphibolite but an igneous rock has already been suggested by 

 Newland. 3 Beyond is another depression, furnishing but a single 

 outcrop in the nature of a reddish garnetiferous quartz-feldspar 

 para-gneiss that is difficult of classification unless it be the Hague 

 gneiss. If this be the case, then between the metagabbro and the 



Xewland, D. H., N. Y. State Mrs. Bui. 190, p. 31 



Ibid. 



Ibid., p. 30. 



