Limestone Belts of Westchester County, N.Y. 209 
mica, in a feeble amount of base of triclinic feldspar. After an 
interruption it appears again for a short distance to the west- 
ward, where it is much more 
one having a parallel position. 
Eight or nine yards north commences the coarse dioryte. 
At the top of the slope, near the passage of the coarse dioryte 
to the soda-granite, partly in the dioryte but mostly in the 
granite, there are three bands (6) within three to five feet of 
one another, gneissic in constitution. Figure 13 represents 
about a dozen yards of these bands, in the dioryte and granite. 
oe ee pe 8 . 5 
na tt J 
. : 
=~¢ tad eh Set exe Trek 
. * ~~ ng . . 
rat cl 6% Sl ig eens se sah se 
s _ - , - 
oR ER Sa 
Ay: LE Aled tant ay eee - 
= ony i. 8 
Ny 
6 PE Cate eS 
~ - - 
po he or, #4 Se ine ek 
eee ee 
-~ 
~ - 
The upper or northern of the three bands (6°) is exposed with 
‘small interruptions for a length of more than one hundred and 
Am. Jour. ae cage cetom, Vou. XX, No, 117.—Sepr., 1880. 
