if 



Fossili/cro'us RocJcs in Nova Scotia. 195 



ble that a detailed examination of this new locality may aid in 

 unravelling some of the Arisaig mysteries. 



The second new section to which we would refer is situate at 

 the head of Lochaber Lake in the county of Sidney, and on the 

 east of the Ohio Kiver. It appears to extend about 2 miles from 

 N. to S. on the west side of the lake. The strata consist of grey 

 slate which has been very much hardened and thrown into a ver- 

 tical position. The fossiliferous strata appear only on one side 

 of the lake, except where it bends in a westerly direction, and the 

 highest of the Lochaber hills approaches the lake, and then a 

 patch of the grey slate appears on the opposite side. A small 

 lake to the west of the great lake, and from which a stream flows 

 into the Ohio River, bounds a considerable part of the western 

 side of the section. Where the strata are exposed on the highest or 

 S. W. side and in the beds of two or three small brooks, fos- 

 sils are found in situ. Their number is considerable but their 

 variety does not yet appear to be great. 



In consequence of the highly altered state of the strata, casts 

 only are found, but these are often very beautiful. In this state 

 we have abundance of Pentamerus, Orthis, Cornulites and corals. 

 These all appear to be characteristic of this section. A conical or 

 turbinated species of coral is peculiarly so and is of very frequent 

 occurence and often very perfectly preserved.* It is truly beauti- 

 ful, and appears to the common observer as the most striking of 

 the Nova Scotia silurian fossils in my collection. 



I have also found here, but not in situ, a cast of a large Ortho- 

 ceras. Its length is 8 inches — it tapers very little — the siphuncle 

 is central — cross section is elliptical having a transverse diameter of 

 li inches and a conjugate diameter of 1 inch. The fossils of this- 

 section are generally found like our elegant coral and Orthoceras 

 in the cairns piled up by the farmers in the overlying fields. In 

 the cairns of the northern part of the section the fossils appear 

 chiefly to correspond with those of the upper group of Arisaig, 

 Here we have the Dalmania Logani the Calymene Blamenhachii 

 the Bellerophon trilobatus, and a tuberculated criniod, so that 

 it is possible we have here an equivalent of the upper Arisaig 

 groups as well as a lower group probably the equivalent of the 

 Wenlock limestone of Murchison. 



I hope yet to have opportunities of examining these sections 



* A ZaphrenitiSj see note. 



