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southward, the dike could not be traced at all, due to the talus and 
overgrowth of weeds. . 
Dixe II. This occurs five feet east of No. 1, and is parallel 
to it. It is 144 inches wide at the level of the stream on its north 
bank, but unlike No. 1, it grows thinner and seems to pinch out 
toward the center of the stream. It grows thicker as we ascend 
the bank to the northward, and six feet above the level of the 
stream has increased to five inches in thickness. It no doubt 
grows wider as we ascend but is inaccessible in this direction. 
Dike III. Following up stream to the foot of the second 
falls above the Tully limestone, we come to another set of dikes. 
The first of these that we reach in ascending the stream, is best 
seen on the south bank. It is from 6 to 7 inches wide at the level 
of the water and can be distinguished crossing the bed of the 
stream at nearly right angles and with practically the same width. 
The south wall of the gorge is nearly vertical at this point, and 
makes an excellent place to study the dikes. Dike 3 strikes exact- 
ly north and south, magnetic. In the cliff, 16 feet above the level 
of the stream, the dike has become four inches in thickness and 
sub-divides into two parts, each less than an inch in width. These 
continue upward a few feet, gradually pinching out. 
The fresher rock is of a dark green color, resembling the 
rock of the Green street locality at Syracuse quite closely, except 
that the jet black particles are very much smaller. No inclusions 
were noticed in the rock. Where weathered it is lighter in color, 
and when badly decomposed is of a greenish-yellow color. There 
is about one inch of greenish-yellow serpentinous earth on either 
side of the comparatively hard five inch center of this dike. Lin- 
ing the sides of the fissure and adjoining the dark colored shales 
is a layer of white crystalline calcite 3-16 of an inch in thickness. 
Dike IV. Two feet east of No. 3, another parallel dike, 1%4 
and then thins out again, disappearing at 151% feet above the 
level of the stream and extends upward a short distance beyond 
the upper extremity of dike No. 3. Three feet above the water 
and fifteen inches east of dike No. 3, two small dikes, an inch 
apart and %4 and % inch in thickness respectively, occur. They 
