HONEYMAN — ON NOVA SCOTIAN GEOLOGY. 15 



The only difference is that formerly the rocks were regarded as 

 altered Lower Carboniferous conglomerate, now they are regarded 

 as altered Oneida conglomerate. 



This fine series of Middle Silurian, Upper Silurian and Devonian 

 strata exposed on the shore dip, in a general southerly direction ; 

 exposed in and near Arisaig Brook, Doctor's Brook, and McNeil's 

 Brook are similar strata ; at least one of the middle members of the 

 series is found dipping in a general northerly direction. The two 

 thus form a synclinal. On the east branch of Doctor's Brook, 

 and a small southern tributary is an insulated patch of Lower Car- 

 boniferous strata consisting of a considerable band of limestone, 

 underlaid by conglomerate greenstone and porphyry. I have cha- 

 racterised it as insulated. I have tried to connect it with a patch 

 of Lower Carboniferous conglomerate at Malignant Cove, but all 

 connection appears to have been cut off by intrusive greenstone. 

 Both are alike insulated by greenstone and separated from rocks of 

 corresponding age. We have now reached the iiltima thule of all 

 geological investigation in this district prior to 1868. I now 

 pass from the band of fossiliferous rocks which is so instructive 

 and interesting to the Palceontological Geologist into another 

 set of rocks, from which organic remains appear to be wholly 

 obliterated. Before entering upon these, however, I would reca- 

 pitulate to a small extent by describing the boundaries of the fossil- 

 iferous Silurian rocks of the district. On the north they are 

 bounded by Northumberland Strait. Their eastern extremity is 

 McNeil's Brook on the beach of the same Strait. On the west 

 they are bounded by McAra's Brook, its Devonian slates and 

 overlying sandstones, interstratified trap and limestones. The east 

 branch of Doctor's Brook until it turns south, and its main branch 

 until it turns to the same direction. Opposite Arisaig Pier are 

 parts of its southern boundary. The remainder on the south side 

 is obscure. Any continuation of these in a westerly direction lie 

 under the carboniferous formation of Pictou County. As I have 

 generally adopted the ascending order in my geological descrip- 

 tions, I would now in this order record my investigation of the 

 metamorphic band that lies to the south of the band already 

 described. My starting point lies to the south of Doctor's Brook, 



