THE GEOLOGY OF MOUNT KEARSARGE 409 



99.37 99-51 



L Coarse quartz-porphyry, red in color, finely granular groundmass 

 small in quantity and distributed among the coarser red feldspars ; from the 

 1,350 foot elevation near the phyllite, on south slope of Mount Kearsarge. 

 Specific gravity 2.614. 



II. Bluish-gray quartz-porphyry, groundmass fine, of bluish-gray color, 

 inclosing anhedra of quartz and phenocrysts of red feldspar. From 1,550 

 foot elevation, south slope. Mount Kearsarge, near phyllite. Specific gravity 

 2.62. 



III. Dark gray quartz-porphyry; from top of Mount Kearsarge, Spe- 

 cific gravity 2.643. 



IV. Dark gray quartz-porphyry, abounding in quartz crystals ; from 

 eastern slope at about 2,000 foot elevation. Specific gravity 2.64. 



With these analyses of the porphyry, together with that of 

 the Conway granite before us, we may consider the relation of 

 the porphyry to the granite. It has been pointed out that there 

 is generally in Mount Kearsarge and Mount Bartlett between 

 the porphyry and granite a granite-porphyry. The best place 

 to study the relation of these rocks in Mount Kearsarge is on 

 the southern slope in the trail. Though the rock surface is not 

 exposed as much as might be desired, nevertheless it is pos- 

 sible to observe a reasonably well defined gradation from Con- 

 way granite into the granite-porphyry, and then from the latter 

 into the quartz-porphyry. 



But this gradation may be more clearly and easily seen in 

 the bed of Cedar brook in the lower part of Moat mountain. 



Beginning at the 900 foot contour in the brook bed, there 

 appears what is clearly the Conway granite, though possibly a 



