1 10 PROCEEDINGS OF THE ACADEMY OF [1890. 



In this occurs vermiculite, or Hallite, and actinolite, apparently 

 the result of the decomposition of an interbedded mineral, some- 

 times in lenticular masses, sometimes in narrow beds, and in some 

 places looking as if the grauulite itself had changed into serpentine. 

 One measurement gave strike N. 45° E. dip 65° N. W. The only- 

 certain thing, however, was a general northeast and southwest strike. 

 On the north side of the cut there was much more granulite than 

 serpentine, on the south side more serpentine than granulite, but both 

 were intermixed on the two sides. 



In the road which skirts this hill, south of and generally lower 

 than the railroad, the same intermixture of granulite and serpentine 

 may be seen, the granulite greatly in excess. 



In the hill northeast of the cut is an abandoned serpentine quarry. 

 Here also the granulite occurs in the serpentine, looking more like 

 a dyke than elsewhere except on Chrome Run, and at Crump's 

 quarry hereafter mentioned, but the exposure does not decide the 

 question. 



West of the Lenni cut and near Lenni station, the ]\Ianayunk 

 rocks, or rocks very like them, appear in a large quarry, the rock 

 here being a schistose gneiss. 



From Lenni and Glen Riddle roads lead northwestward and join- 

 ing, run through Lima to Sycamore Mills, on Ridley creek, near 

 Blue Hill. 



On the Lenni road the gneisses appear, followed by loose masses 

 of the honeycomb quartz ; on the Glen Riddle road, the quartz only 

 is seen at the surface, but where the underlying rock is exposed by 

 washes in the road gutters, it is seen to be gneissic or schistose and 

 not serpentine or quartz. The honeycomb quartz is visible along 

 this road nearly to Sycamore Mills, in other words from near Ches- 

 ter creek, to near Ridley creek, but not immediately on either. 

 About a mile west of Sycamore Mills is a road close to the Middle- 

 town public school, or the Barren Hill school-house. It covers a 

 considerable area visible on the south bank of Dismal Run, but on 

 the Lenni road it is not visible, the surface being a loam with inter- 

 mixed honeycomb quartz. 



On the Lima-Lenni road, northeast of the school-house, on the de- 

 scent from the table land to Ridley creek, near the mouth of Dismal 

 Run, the granulite suddenly appears in great quantity and evi- 

 dently in place. Northwestward of Dismal Run the Laurentian with 

 all its characters occui's in abundance, forming a steep ridge probably 



