G8 HONETMAN GEOLOGY OF ANTIGOXISHE COUNTY. 



These are the undoubted equivalent of the series in question. 



The Middle Arisaig series has no representative on the Col- 

 chester side. It is well represented, as has already been observed 

 in the conglomerates, jaspers, slates, shales, diorites and porphyries 

 of the Cumberland side of the I. C. R. 



(II). — I have elsewhere shown the relationship of George's 

 Mountain (C. B.) rocks to the lower Arisaig series. (Transactions 

 1872-3.) 



In 1860 I found red syenites at the mouth of Louisbourg Har- 

 bour, C. B., and along the shores toward Gabarus. The entrance 

 of the magnificent ocean harbour of this once celebrated fortification 

 of Louis XIV, is a break in this syenitic wall. 



This syenite was observed as crossed in several parts by dark 

 green homogeneous diorite. These had not been previously indi- 

 cated in the Geological map. 



Mr. Bowser, Halifax, who has been engaged by the Department 

 of Marine and Fisheries in repairing the light-houses of Scatarie 

 ^sland, which lies to the north of Louisbourg, has presented to the 

 Museum a very interesting collection of rock specimens from the 

 island, which shew that it is composed of rocks of the Middle 

 Arisaig series. The rocks of West Point, as shown by the speci- 

 mens, are jaspideous conglomerates and diorites. One conglom- 

 erate is brown, with crystals of feldspar, like a porphyry. The 

 others are green, w T ith pebbles of brown and red jasper. The diorite 

 is homogeneous and coarsely crystalline. If the syenites of Louis- 

 bourg and the carboniferous strata of the Cape Breton County were 

 to be extended eastward, so as to run parallel, the rocks of Scatarie 

 would lie between them. A conglomerate boulder from the beach 

 derived from the rocks on the shore of Scatarie is of peculiar inter- 

 est. Being polished, it shows an imbedded pebble of many striped 

 jasper, which might be regarded as derived from the striped jasper 

 ./and associated with the ophicalcites, marbles, &c. of George's 

 Mountain, C. B. (Paper in Transactions 1872-3.) This is admit- 

 ted by all who have compared the boulder with the specimen of the 

 jisper rock in the Museum. The Scatarie conglomerates very much 

 resemble those of the I. C. R. in the Cobequids. These and other 

 considerations seem to justify the opinion — obliterated by mistake : 



