REPORT OF THE DIRECTOR 1923 17 
CEOVOGICATETSURVIDY) 
The areal geological survey of the State has been continued in the 
Adirondack region by the completion of the Gloversville quadrangle. 
Progress in this difficult region is slow but the Adirondacks have 
now been geologically surveyed on the scale of 1 mile to the inch 
for nearly one-half their extent. 
During the present season special attention was given by Pro- 
fessor W. J. Miller to the geological structure of the Thirteenth 
lake quadrangle in the south-central region of the Adirondacks. 
It is an area of special interest and presents many problems diff- 
cult of resolution. A large part of the foundation rocks are the 
primitive Grenville limestone and its allies, which represent the 
oldest sedimentary formation of which there is any knowledge. This 
has been broken through by extensive developments of deep-seated 
igneous rocks which cover many square miles and seem to be entirely 
separate from the igneous masses farther to the east in Essex and 
Franklin counties. These deep-seated rocks are cut across by nu- 
merous injections of granite which indicate that the former was 
sufficiently consolidated to fracture when the granite was injected. 
Garnet-bearing rocks are widely distributed throughout this region, 
and the evidence strongly indicates that the garnet rocks of the 
Barton mine on Gore mountain and the Hooper mine near Thir- 
teenth lake were formed by some kind of interaction along the 
contacts of unlike masses of igneous rocks. The Sacandaga river 
from Oregon south, follows a line of faulting and the topography 
indicates that Thirteenth lake lies in a fault depression. In south- 
eastern New York, through the complicated Schunnemunk moun- 
tain region and its extension to the east of the Hudson river, some 
field work was carried on by Mr Walter J. Yeaton. It is hoped 
to continue the survey of this region during the coming season. 
Dr Rudolf Ruedemann has continued the delineation of the 
seological formations in the region known as the Capital district 
which includes four quadrangles. In view of the growing interest in 
the geology of Albany and its vicinity this work, when completed, 
will be an important guide to students of science. 
