192 REPORT ON CORRELATION 
in the work of the committee, and his place was taken by Dr. A. E. 
Barlow, of the Geological Survey of Canada. Dr. Barlow, however, 
was able to remain in-the field only during a period of about ten days 
when the committee was at work in the Adirondack Mountains. 
Dr. A. W. Spencer, of the United States Geological Survey, 
accompanied the committee from July 6 to July 23. 
This special committee met at Whitehall, N. Y., on July 4, and 
spent the month of July, 1906, in visiting various districts in the 
Adirondack Mountains and in the eastern portion of Ontario, with 
the view of ascertaining, if possible, whether they could agree upon 
the succession and correlation of the great exposures of pre-Cam- 
brian rocks in these areas, and also upon the nomenclature which 
should be adopted in the classification of the same. 
The mapping of the eastern Adirondack area is now being carried 
on by J. F. Kemp, and that of the northern Adirondack area by 
H. P. Cushing and C. H. Smyth, but this work is not as yet completed. 
The area visited by the committee in Canada was for the most 
part that whose mapping has just been completed by F. D. Adams 
and A. E. Barlow, and which is comprised in the Haliburton and 
Bancroft sheets of the Ontario series of geological maps being issued 
by the Geological Survey of Canada, printed copies of the maps in 
question being supplied to the members of the committee when in 
the field. The geological report on this area, however, has not as 
yet been published. 
The committee also visited, while in Canada, the Madoc region, 
which lies to the south and southeast of the area mapped by F. D. 
Adams and A. E. Barlow. This area was in the early years of the 
Canadian Survey mapped by Mr. H. G. Vennor, and a portion of 
it was ata later date mapped on a larger scale by Mr. Eugene Coste. 
In making the present report, therefore, the committee wish 
it to be distinctly understood that in it they are not presenting any new 
observations made by them in the areas visited, but are merely record- 
ing certain facts pointed out to them by Dr. Kemp and Dr. Cushing 
in the Adirondack area, and by Dr. Adams in eastern Ontario, which 
will be described in detail in the forthcoming reports by these several 
gentlemen. To the interpretation of these facts by the gentlemen 
in question the committee give their full assent, and upon them 
