Crystalline Limestones of Warren Co., X.J. — Westgate. 369 
THE AGE OF THE CRYSTALLINE LIMESTONES 
OF WARREN COUNTY, NEW JERSEY. 
By Lewis G. Westgate, Evanston. 111. 
The petrographic characters of certain crystalline lime- 
stones of Warren county, New Jersey, have already been de- 
scribed in the American Geologist for last month. It is the 
purpose of the present paper to consider the evidence of their 
geological age. These rocks occur in a belt along the eastern 
border and at the northern end of Jenny Jump mountain. 
Their more exact location is given in the accompanying map. 
H 
A ,-''"'' 
*'* AJ; ', 
,--'"' f « i 
,<<*' ff s C / 
^ 5 
i£ <* 
j/4" K< ^>° 
,''>'/ EXPLANATION 
-p / .' a? Crystalline. Limes'tona. 
..-$' f/* Gneiss e.o.st oy Cry st, Lj. 
A ,1 .' i ■ B0u.ncL0.v4 wtween- mou-nto-in. 
^ : W* ' J-ivA. HLo.i.r>-. 
•' i 1 Tm\e,. 
Fig. i. Map of the northern part of Jenny Jump mountain. New Jersey, 
which is based* upon field work done while the writer was in 
the employ of the U. S. Geological Survey. Localities A to E 
are exposures which, from their alignment and general paral- 
lelism of strike, apparently represent a single band of lime- 
