IBS 



CONCRETKWARY STRUCTURE IN ROCKS — WESTON. 



where tliis discovery was made, visited the mines, and brought 

 away a number of these so-called fossils. They were given to 

 me by Dr. Selwyn, director of the Dominion Geological Survey, 

 for microscopic examination ; and, I regret to say, the result is 

 precisely the same as for those examined thirty years ago. 



They appear to be composed of dolomite, and, when dissolved 

 in hydrochloric acid, leave a good percentage of insoluble matter, 

 probably felspar and silica. It is likely that they were 

 spheroidal or ovoidal in form before being flattened by the 

 pressure of overlying beds. One of the specimens before me is 

 a piece of greenish-grey laminated mica-schist Ave inches long 

 and one inch thick. Inclosed in this are four of these concre- 

 tionary forms broken through the centre, each measuring one 

 inch in lenp'th and half an inch in breadth. Two of these are 

 connected with each other by a thin strip of . the material of 

 which they are composed. 



dolomitic concretkjns in gold-bearing rocks <)¥ xova 



Scotia. 



In broken sections some of these bodies show slight concen- 

 tric layers which in microscopic sections are not seen. Not a 

 trace of organic structure was found. 



I (juite agree wnth Professors Hind and Kennedj^ as to the 

 importance of finding fossils in the auriferous rocks of Nova 

 Scotia, and trust they have been more fortunate than I 



It is well known that concretions occur in all rcjck formations. 

 One or two instances will be worth recordince to sliow how care- 



