196 REPORT ON CORRELATION 
in its present form. In the evening all moved to Plattsburg, where 
H. P. Cushing became the guide. 
In the eastern Adirondacks the attempt was made to visit the 
rocks of actual or probable sedimentary character, rather than the 
great eruptives of whose nature there is much more certainty. 
B. ITINERARY IN THE NORTHERN ADIRONDACKS 
(Under the guidance of H. P. CusHinc) 
On July 11 the party went from Plattsburg to Tupper Lake, with 
stops at Dannemora and Saranac. At Dannemora amphibolites 
were seen, cut by granitic gneisses, and both cut by unmetamorphosed 
dikes of diabase and syenite porphyry. The locality was typical 
of a great area in the northern Adirondacks where such a gneiss 
complex prevails, along with frequent gray gneiss of intermediate 
composition. The origin of the amphibolite is uncertain. The 
complex has been called the Saranac gneiss and is precisely like that 
seen later in many places in Canada. 
At Saranac a locality was visited which showed irruptive contact 
of anorthosite with gneisses which, while themselves of somewhat 
doubtful nature, are in close association with undoubted Grenville 
sediments near at hand. 
The following day the party drove from Tupper Lake to and 
through Litchfield Park, seeing the gradation from the typical green 
syenite along the lake to the reddish, granitic phase of the same 
rock in the park, and seeing also the red granites, almost wholly 
quartz-feldspar rocks, which cut the syenite. A small anorthosite 
outlier was also visited. ‘This is surrounded on all sides by the red 
syenite, which, as the anorthosite is neared, grades into a basic green 
syenite which cuts the anorthosite, though the best locality for seeing 
this was not located. Adams did not accompany the party on this 
day. 
July 13 the committee drove from Tupper Lake to Axton, seeing 
first green syenite, followed after an interval with no exposures by 
anorthosite cut up by dikes of varying sizes of a rock which H. P. 
Cushing believes to be the syenite, and which seemed such to the 
other members of the party except A. W. Spencer, who expressed 
some doubt as to the equivalence. Beyond, the route was entirely 
