108 HOKEYMAN — ON PRE-CAEBONIFEROUS ROCKS OF PICTOU. 



apparently non-fossiliferous ; this extends to the north east corner of 

 the area and there terminates, forming the falls of Sutherland's 

 Biver. This band is overlaid by shales having characteristic 

 Clinton fossils in abundance, e.g. Leptocoelia intermedia, Hall. 

 These strata are found at Cameron's Brook, and on the side of the 

 old road, all being situated in the area in question. These sup- 

 posed Devonian rocks, then, are also Middle Silurian., I would 

 now turn to the south east corner of the area, and enter the area 

 from that direction ; w-e find the bridge built on strata containing 

 lingulae 7iot characteristic. These are abutted by Lower Carbon- 

 iferous sandstone of the river bed. On the right side of the road 

 at the miller's house the end of a trap dyke underlies the lingula 

 strata ; nearly half a mile from tlie bridge the same strata are seen 

 outcropping on the right side of the road, and then passing over to 

 the left side. On the right side we have the same greenstone dyke, 

 and on the left abundance of orthids and other fossils characteristic 

 of the lovv^est part of the A. or Medina strata of Arisaig, and 

 then in an exposure of the same strata at the bridge of a tributary 

 of Sutherland's River, Cameron's Brook, described by Sir W. 

 L/02:an in page 6 of his report, I found several Petraia similar to 

 these of Fraser's Mountain and Arisaig A strata. Following the 

 course of this tributary towards Sutherland's River -we have the 

 same strata with Petraia reaching to the Falls : there they overlie • 

 the same greenstone dyke. This Medina band is overlaid and 

 succeeded on the south by Clinton strata, in which we have the 

 exact counterpart of the Lower Clinton B of Arisaig with its black 

 shales, concretions and Lingula nodules. This shale is not 

 included in the supposed Devonian area. 



I would observe that the greenstone dykes referred to may be 

 Devonian, as they are undoubtedly ^jg5^ Upper Silurian and ^re- 

 Carboniferous, so that with this possible exception the whole of 

 Sir W. Lo Oman's Devonian Rocks are of Middle Silurian asje. 



The fossils that I have referred to illustrative of the palasontology 

 of these rocks, are in the Museum of the Canadian Survey, Gabriel 

 Street, Montreal, and in the Provincial Museum, Halifax, and 

 also my maps illustrating their stratigraphy* 



