HONEYMAN GEOLOGY OF ANTIGONISH COUNTY. Ill 



crystals of iron pyrites to the west of Lochaber lake, but these are 

 not found in situ. The upper part of this band of Devonian slates 

 at Poison's lake, is of a darker hue than the others. In these are 

 found a vein of specular iron ore of considerable thickness, highly 

 micaceous, and among the drift are masses of oxide of iron with 

 cupriferous iron pyrites. Attached slate show decisively that these 

 have been derived from the underlying slate, and it is probable that 

 the massive oxide of iron was originally a carbonate of iron. Small 

 veins of carbonate of iron with copper pyrites have been found in 

 the slates exposed by mining. I would observe that these strata in 

 this locality have been complicated by trap dykes, and considerably 

 eroded and obscured. I have been unable to discover fossils in this 

 extensive formation. In the Marshy Hope which is intermediate 

 between Arisaig and Lochaber, there are certain hard slaty rocks 

 outcropping about ten and eleven miles from the town, where 

 %e Antigonish mountains come near to the highway. After 

 the discovery of the Petraia (a) rocks of Lochaber, I observed 

 those of Marshy Hope, and was struck with the resemblance 

 between the two, and on examination I found that they were 

 identical. In the latter locality I discovered Lingula, then Petraia 

 Forresteri, Ortlioceres, Orth.es, Cornulites, and Cornulites (trumpet- 

 shaped), &c. Subsequently I found, although not in situ, still nearer 

 to the town, near the Antigonish mountain road and near a small 

 tributary of James' river, other fossils of the same age. These dis- 

 coveries led to the conclusion that the one is the extension of the other, 

 and that they do exist or have existed as a band skirting the Anti- 

 gonish mountains. This opinion was confirmed by a still farther 

 discovery of similar rocks containing similar organisms at the western 

 extremity of these m_ountains, on the side of the road at the western 

 entrance of the Marshy Hope. I have not yet succeeded in ascertain- 

 ing their eastern termination. In the place where I first discovered 

 the strata in question in the Marshy Hope, I also found a specimen 

 of the Avicula Honeymani (Hall). This fossil is one of the charac- 

 teristics of Arisaig d. It is found in abundance in this position, 

 both at Arisaig and East Eiver, Pictou, and in this position only, 

 I am persuaded that we have here Arisaig a and d, or the equiva- 

 lents of the Hudson (?) and lower Helderberg in contact, while b, 

 b' and c are missing. We have several out-crops of rocks from this 



