Crystalline Limestones of Warren Co., X.J. — Westgate. 375 
with that of the gneiss on either side. This, with the posi- 
tion of the limestone between gneiss outcrops, seems to indi- 
cate that the limestone is interbedded with the granitoid 
gneiss along the eastern side of the mountain. The intimate 
association of the limestone with the gneiss is at any rate ap- 
parent. 
At F and G outcrops of crystalline limestone also occur. 
At F (just east of the Stinson mine), a band of crystalline 
limestone occurs in the gneiss, dipping 50° S. E., and with a 
strike of N. 40° E. This band is about six feet in thickness 
and is parallel with the banding in the biotite gneiss with 
which it is associated, and acts in every way as a conformable 
"member of the gneissic series. This outcrop cannot be traced 
in either direction along the strike, and appears to be local. 
At G the relations of the limestone are the same. It is not 
impossible that these two small outcrops niaybe of the nature 
of segregations rather than true beds. They are less coarsely 
crystalline than the other outcrops and contain a consider- 
able amount of basic impurities. 
The relations of the northern Jenny Jump limestones will 
be discussed later. Enough has been said to show that out- 
crops A to G are closely associated with the gneisses and ap- 
pear to be interbedded with them. 
The crystalline limestones and eruptive rocks. Besides this 
interrupted band of outcrops, there is, as already described, a 
large area of crystalline limestone at the northern end of the 
mountain. The limestone here is cut by numerous eruptive 
rocks. These are coarse granite or pegmatite, which occurs 
in large irregular masses; diabase in dikes up to fifty feet in 
width; and diorite, which is by far the most abundant of the 
three. These eruptive rocks, however, can not be considered 
the agent of the metamorphism which has taken place in the 
limestone. The reasons for this statement are as follows: 
(1) If the eruptive rocks were the agents of metamorphism 
the limestone should be most crystalline at the contact with 
the eruptive, and should become less crystalline as the dis- 
tance from the eruptive rock increases, until at no very greal 
distance an unaltered non-crystalline limestone should be 
found. This limestone should lie the same as the lilue mag- 
nesian limestone of Kitta tinny valley, if, as some writer- as- 
