Gregory.] QUARTZ-TRACHYTES. Ill 
field Junction called Quoggy Joe, and it also occurs as a dike outcrop- 
ping on the south branch of the Presque Isle River about the middle 
of T. 9, R. 3. 
QUOGGY JOE QUARTZ-TRACHYTE. 
Quoggy Joe is the prominent member of a group of hills with out- 
lying knobs that form part of the divide between the Presque Isle 
and Meduxnekeag rivers. The ridge extends several miles in a north- 
east-southwest direction. Beginning on the north with low knobs, it 
rises to a height of 300 to 400 feet above the general level at Quoggy 
Joe and continues as Green Mountain into the unexplored region 
farther south. The hill as viewed from the east or west presents 
steep slopes from base to top, but the northeast side is easily ascended 
by following the ridge, difficult climbing being found only near the 
top. Angular blocks of light-colored rock varying in size from an inch 
to many feet in diameter cover the upper slopes. Wherever the rock 
is exposed on top of the hill it is cut by wide cleavage cracks which 
run continuously in the same direction (about northeast) for many 
feet. Less distinct cracks intersect these, so that the whole hill is 
seamed and fissured into giant blocks. So prominent and regular are 
these cleavages that the hill gives the impression of being a sedimen- 
tary mass. Quoggy Joe has a lake at its eastern base, and elsewhere 
is surrounded by swamps and forests, so that the limits of the igneous 
mass could not be traced. The trachyte extends less than a mile from 
the hill to the east, as shown by the occurrence of seclimentaries just 
beyond Quoggy Joe Lake. 
QUARTZ-TRACHYTE OF TOWNSHIP 9, RANGE 3. 
The second occurrence of quartz-trachyte is on the Presque Isle 
River and is a very inconspicuous exposure, seen only as a small ledge 
extending from the bank. The rock as it appears in the ledge is 
specked with shining quartz and is exceedingly tough. The heavy 
vegetation prevents a determination of the width and extent of the 
mass, and even prevents definite ascertainment whether it is a dike. 
The locality is difficult of access, owing to its distance from settlement 
and the lack of roads which can be used in the summer season. 
ANDESITES. 
Andesites are very rare rocks in eastern United States, but are the 
most abundant extrusives so far found in northern Maine. They form 
prominent hills and determine the general topography in some places, 
while in others they are represented by isolated remnants among the 
sedimentaries. The greater number of occurrences are of lava and 
breccia, but andesitic ash and tuff are also found well developed. In 
the following descriptions only the more important localities will be 
