1890.] NATURAL SCIEXCES OF PHILADELPHIA. 109 



Between Chrome Run and the next creek west is a cut, in the 

 easterly part of which serpentine and honeycomb quartz occur. To- 

 w-ard the middle of the cut, decomposed granulite appears, embed- 

 ded in which are masses, sometimes pebble like, sometimes bedded, 

 of actinolite, all much decomposed. Following this the granulite 

 is distinctly stratified, mostly regular, some of it contorted, striking 

 S. 20° E. nearly vertical, looking much like that west of Elwyn. It 

 contains some hornblende and actinolite. The valley of the creek 

 beyond is quite deep, with steep banks, and the floor of the valley 

 rises very rapidly northward. On the hill between Chrome run 

 and this creek, near the railroad, honeycomb quartz is visible in the 

 soil, but, going northward, schists soon appear in quantity, succeeded 

 by masses of granulite ; and this, near the source of the creek, and 

 near the point at which the Lima road forks to Lenni od the west 

 and to Glen Riddle on the east, gives place to honeycomb quartz. 

 None of these rocks seem absolutely in place, but their quantity 

 is so great, that their existence under the surface cannot be doubted. 



Returning to the railroad, the next cut is that in which Glen 

 Riddle station is located. In this the chief rock is the decomposing 

 granulite with serpentine and honeycomb quartz, the serpentine and 

 granulite so intermixed and so decomposed, that it requires close 

 examination to distinguish them, but the serpentine can be seen in 

 unquestionable granulite, and the granulite in unquestionable ser- 

 pentine-like rocks. In this cut there appears to be a gentle westerly 

 dip and the propoi'tion of the granulite to the serpentine seems to 

 increase as the depth increases. 



The cut west of that at Glen Riddle and east of Lenni, the lo- 

 cality of vermiculite, actinolite, yellow quartz, Delawarite and 

 Lennilite, shows the granulite much more massive and less decom- 

 posed than any of the preceding. This cut is a curve on the 

 southerly slope of a steep hill, so that the south bank is compara- 

 tively low, that on the north rising steeply probably 100 feet. The 

 top of the hill is honey-comb quartz, then there is a terrace, probably 

 made in the grading of the railroad, apparently almost entirely 

 granulite, and then on the slope to the railroad is granulite, some of 

 it with crystals of feldspar an inch or more in size (Delawarite, 

 Lennilite), some very fine grained, much of it very heavy bedded 

 and compact, very hard and entirely undecomposed, and some of 

 it soft and decomposed. 



