388 HONEYMAN ON NOVA SCOTIAN GEOLOGY. 



contortion, are difficulties in the way of settling this question y 

 although these apparent difficulties may not amount to much in the 

 face of systematic and thorough investigation. The barite has 

 been somewhat extensively mined for the manufacture of white 

 paint. 



From the river below, the lofty, extensive and precipitous 

 exposure of rocks, with its numerous pigeon holes, (adits) and 

 shoots for conveying the mineral to the river, and picturesque sur- 

 roundings, present a scene striking and imposing. 



Returning to the mountain road we have, succeeding the crys- 

 talline, a band of uncrystalline rocks — slates and shales, an extension 

 of the slates and shales of the Intercolonial Railway section and the 

 Londonderry mines. These present no feature of importance. 



At last we come to Harrington River, on the right side of the 

 road, with its section of the carboniferous band of the Intercolonial 

 Railway. Here we have a considerable thickness of slates, which 

 very much resemble the slates of the preceding band. They are 

 unconformable to the Upper Silurian. Many of the strata are 

 beautifully ripple marked. These are succeeded by black strata, 

 having shales with modiola, patches of scales of palceoniscus with 

 modiola and cordaites (.^) These are unmistakably lower car- 

 boniferous. The section of this formation extends onward to the 

 mouth of the river, where it is overlaid by the new red sandstone^. 

 This band extending to the shore is terminated by Trap, an 

 extension of that which constitutes a great part of the Five Islands 

 and Gerrish Mountain. The trap of these Islands is celebrated on 

 account of its minerals. That of Gerrish Mountain has a vein of 

 magnetite — magnetic iron ore. 



The trap at the end of the section has elevated the strata in this 

 direction, and given the new red sandstone the form of a synclinal. 

 On the road side, about a mile to the eastward, we find an exposure 

 of the same band, having a southerly dip. This has received its 

 direction from the trap of the Islands. 



Gerrish Mountain is the eastern extremity of the trap which 

 crosses the Bay of Fundy to Blomidon, and extends westward to 

 Bigby and Briar Island. 



