108 PROCEEDINGS OF THE ACADEMY OF [1890, 



bearing 5° or 10° north of the strike going westwardly. Here may be 

 seen some very hard compact gneiss, both granitic and hornblendic, 

 interstratified in the schists. About a mile from Ridley creek, a 

 short distance west of Elwyn station, the schists are very feldspathic 

 and dip 70° to 90° southeast. West of this is a deep cut, the schists 

 continuing very feldspathic with coarse crystalline feldspar in thin 

 beds, all much decomposed, some hornblendic gneiss and some 

 included quartz, and some massive beds of a granite almost granulite, 

 the strike and the dip about the same. Suddenly, on the north side 

 of the cut, honey-comb quartz appears, followed by serpentine, and 

 this by a coarse hornblende rock, containing grains of a yellow 

 mineral, probably chrysolite, and this is followed by serpentine to 

 the end of the cut probably 200 feet. 



On the south side of the railroad the feldspathic schist continues 

 without a trace of serpentine, but the hornblendic rock does appear 

 on the south side. This will be referred to hereafter. 



AVest of this, the ground is lower, and there are no exposures for 

 about a quarter of a mile to Chrome Run, which rises on the extreme 

 northern edge of the table-land, and flows nearly south into Chester 

 creek. On the east side of the creek are large serpentine areas, but 

 there is evidence too of much granulite, here being the celebrated 

 Black Horse moonstone locality. Along the creek the ground is 

 low, but near where the State road crosses it, its bed is a granulite 

 excessively jointed, hence easily quarried and making a good build- 

 ing stone. The dip and strike are not clear. On the west side of 

 the creek at the railroad, much earth has been removed to construct 

 embankments and here the granulite is in large quantity but poorly 

 exposed. 



On the east side of the creek a similar removal of earth lays bare 

 a ridge of diorite, part of it very compact, part schistose, with the 

 unusual strike N. 30° to 40° W. and a dip of 70° to 90° northeast. 

 This is cut off by large masses of granulite striking X. 20° E., some of 

 it fine grained, some containing large crystals of feldspar, in fact al- 

 most a porphyry. The contact is concealed, but the diorite is visi- 

 ble within a foot of the granulite. It would seem difficult to ex- 

 plain this except by regarding the granulite as intrusive, and per- 

 haps the diorite here is similar to that of the hornblende rocks in the 

 cut to the east before mentioned. 



The close correspondence of these occurrences with the observations 

 of the Canadian geologists as to the Black Lake serpentines here- 

 after mentioned is apparent. 



