194 REPORT ON CORRELATION 
South Bay they traversed platy quartzose, garnetiferous, sedimentary 
gneisses, with intrusions of gabbro and trap dikes. ‘They observed 
in the gneiss a development of graphitic schist which has been mined. 
Proceeding several miles up Pike Brook, the party crossed an outlier 
of Potsdam sandstone faulted down between the hills of gneiss, and 
to the southwest on the old State Road saw a ledge of about forty 
feet of graphitic schist capped by gabbro. Returning, they recrossed 
South Bay and went over the high ridge to Whitehall, crossing doubt- 
ful gneisses, believed, however, to be probably sedimentary. ‘The 
same evening the party moved to Ticonderoga. 
From Ticonderoga, on the following morning, the committee 
proceeded to Hague on Lake George, and visited the Lakeside graphite 
mine, where a graphitic quartzite six to ten feet thick is inclosed in 
garnetiferous, sillimanite gneiss. Still lower are gneisses of quartzose, 
feldspathic composition. The party then rowed to Flirtation Island, 
north of Hague, where a gneiss which closely resembles a conglom- 
erate was finally interpreted as one injected with pegmatite stringers 
and subsequently squeezed. Farther north at Indian Kettles Point 
a massive, garnetiferous granitic gneiss was seen which was believed 
to be intrusive. Returning to Hague, the steamer was taken to 
Rogers Rock, and the party climbed Rogers Slide, a summit about 
850 feet above the lake. They crossed much white crystalline lime- 
stone, charged with silicates, graphitic pegmatites, and rusty gneisses, 
until toward the summit they passed to decidedly massive garnetif- 
erous granitic gneiss, similar to the exposures on Indian Kettles Point. 
All were impressed with its igneous affinities, and attributed the 
garnets to the influence and contributions of the neighboring lme- 
stones. The rock is believed by J. F. Kemp to be an acidic phase 
of the syenitic eruptives which are normal and abundant in the vicinity. 
Proceeding to Ticonderoga on foot, the party traversed typical 
green syenite at the outlet of Lake George, and had no doubt of its 
eruptive nature. 
The next morning the party moved to Port Henry and walked 
north on the tracks of the railway on the shores of Lake Champlain. 
Passing across faulted blocks of Beekmantown and perhaps upper 
Potsdam, they encountered a large intrusion of gabbro. At first 
gneissoid on the south, the gabbro passes gradually into more massive 
