Trof. Bonney — Eozoon at Cote St. Pierre. 



295 



ordinary crystalline limestone, containing, usually, numerous granules 

 of serpentine, which sometimes exhibit a very distinct banding re- 

 sembling a stratification. Thus the structure may form an "aureole" 

 round a nodular mass of serpentine or pyroxene, but it may also 

 occur upon a mere band or irregular seam of serpentine. In the 

 latter case the structure may take a very irregular curved shape, 

 but vk^hether this was original or due to subsequent bending I could 





.- -^ 



"•^i^W^^v':--*-'^:^^^ 



Fig. 1. — Diagram of Eozoonal Eock at C6te St. Pierre. 

 The closely dotted part is pyroxene or serpentine; the top mass being about 

 2 feet 3 inches long. The zones of "Eozoon" are indicated by the broken 

 wavy lines, generally surrounding these masses. The remainder of the rock is 

 white crystalline limestone, spotted with granular serpentine. 

 This figure appeared in my book entitled "The Story of our Planet,'' and 

 I am indebted to the liberality of the publishers and proprietors, Messrs. Cassell 

 and Co., for the cliche of the block to illustrate this paper. 



not determine. The smaller masses, as Sir J. W. Dawson has more 

 than once pointed out, bear a general resemblance to one of the 

 Stromatoporids. A thinnish band of gneiss is intercalated in this 

 limestone, which crops out in the wood near the road, but, as it 

 happened, I did not see it. 



The next mass occurs in the bed of the valley, and rather further 

 up it, on a farm belonging to a Mr. Levine. It forms a small rugged 

 knoll, which has been quarried. Here also the limestone varies 

 a little in coarseness, and one of the more finely crystalline varieties 

 contains grains of a nearly black mineral, which will be noticed 

 presently. Eozoonal structure is not generally well developed here, 

 but occasionally it may be seen. It exhibits the same relation to 

 pyroxene and serpentine, the same nodular habit, and the same 

 association with calcite containing granules of these minerals, as we 

 have already described. Now and then, especially in the part where 

 the pyroxene was most abundant, a little white mica occurred, 



