78 H0NEYMAN GEOLOGY OF ANT1GONISHE COUNTY. 



syenite and the limestone being intimate, the latter being unaffected 

 by contact with the former. 



2. — The Lower Arisaig series also shows limestone in intimate 

 connection with granitoid diorites. This limestone is crystalline 

 (marble). In some cases it is interbedded (?) with, and penetrated 

 by, green dysyntribite (?) (a serpentine-like rock), leading us to 

 speak of ophite and ophicalcites. There is also a blending of the 

 ophite with the diorites. The associated syenites have, also, in 

 close connection, dark petrosilcx, with veins of quartz containing 

 mica. The syenites and diorites are also penetrated by veins of 

 calcite. The diorites have quartz veins with talc. In the same 

 series there are homogeneous diorites very frequently occurring 

 and seeming to penetrate the syenites, and diorites, and calcites. 

 These seem to be interbedded rocks of igneous origin. 



3. — The Section also shews the lower part of the Upper Arisaig 

 series, in contact with diorites of lower carboniferous age, the result 

 of the contact being the conversion of sandstones into porcellaneous 

 jasper — striped and uniform — other strata being converted into 

 yellow, brown, and mottled dysyntribite rocks. 



4. — I consider that if the cause of metamorphism in the last 

 case, and its action had been brought into association witli the 

 9yenite and lower carboniferous limestone, specified with an addition 

 of silicious and argillaceous sediment, and accidental elements of 

 syenite and diorite — and also if the cause had been augmented and 

 the action intensified — we should have a reproduction of the char- 

 acteristics of the Lower Arisaig series, as in the section, and also as 

 in St. George's River, C B., where we have striped jasper in the 

 place of petrosilcx, and (ophite) with calcite, &c. 



Volcanic. 

 This county indicates volcanic action : 



1. In the Lower Arisaig series, Cambrian? 



2. In the Middle Arisaig series, Loicer Silurian. 



3. In the Upper Arisaig series (Metamorphic), volcanoes of De- 



vonian age, as in Pictou County. 



4. In the Lower Carboniferous. 



