252 THE PICTOU Ct)AL FIELD — I'UOLE. 



the rano-e west to Moiintville, is doubtful, Init there are no other 

 exposures until the summit near the post office is reached. Pos- 

 sibly the intervening ground is all Lower Carboniferous as de- 

 fined on the map, or it may be thinly capping Silurian as at the 

 brook. 



The summit at Mountville, 490 feet, exposes fossiliferous rocks 

 that weather white, and it presents a bold escarpment to the 

 south. To the north and east a depression with surface fragments 

 of sandstone suggests a succession in those directions of Lower 

 Carboniferous, of which series beds mentioned elsewhere are seen 

 lying to the west between it and the succeeding knoll where 

 fossils also are easily found. At the high road the Lower Car- 

 boniferous can be seen, but westward again 200 yards from the 

 road the penultimate knoll of the ridge that overlooks the East 

 river is also Silurian. 



Dr. Honeyman unhesitatingly classes as Middle Silurian the 

 rocks of Waters' hill, and were it not that Sir W. Dawson men- 

 tions having found pinnularia in the slates of this range at Alma^ 

 others also would have concurred in his view ; in part at least, as 

 for instance regarding the slates which rest on the northern slope 

 of Waters' hill nearest the Drunnnond railway. The black and 

 bluish grey slates containing occasional fragments of plants would 

 likely, however, be still considered Devonian even should a more 

 thorough investigation relegate portions of this northern range 

 to the Silurian, and the crest of Waters' hill to the Cambro- 



Silurian. 



Devonian. 



Rocks of this age''' occupy a large section of country to the 

 westward of the Middle river and are crossed by that stream a short 

 distance above the bridge at Union Centre. Between this point 

 and Weaver's mountain their extent Jias not been well defined. 

 Whether they should include the beds seen on the Ease river 

 north of Riverton is open to question. Yet although presumably 

 Devonian, for convenience these deposits may be called the Fish- 



(1) See the references to the Pre-carbonifero'is of Pictou County by Dr. Honeyman in these Trans- 

 actions Vol. in, 2 p. p. IOC, 141 ; Vol. V, 1 p. 72, and Sir VV. Dawson's reply to the Ur.'s criticisms 

 in the Canmltdii Naturalist February, 1879. Acadian Geoloary, p. 502 ; Supplement, p. p. 4S, 70 \. 

 Hartley, p. hi. 



