326 /. H. BRADLEY, JR. 



well-rounded pebbles of sandstone occur with the black limestone 

 pebbles. This indicates that in this place at least we have a normal 

 conglomerate. 



Following the elliptical outcrops of Di to the road about one 

 mile north of Mystic, which runs from Notre Dame to North Stan- 

 bridge, the conglomerate can be seen in outcrops which might be 

 called typical. True bedding is absent. The rock is composed 

 largely of elongate fragments of dark grey and black limestone 

 weathering grey. The matrix, likewise of black granular Hmestone, 

 weathers dark brown and black, thus showing the shape of the 

 pebbles to good advantage. In some places the pebbles are scarcer 

 and the rock has the aspect of a massive black limestone. In other 

 places the rock is made up almost entirely of fragments. The peb- 

 bles range from small round masses one-half inch across to pieces one 

 to two feet in diameter. Associated with these rounder fragments 

 are the more common elongate pieces which range from one-half 

 inch to two feet in length and from one-half to one and a half inches 

 in width. These long fragments have a general alignment normal to 

 the strike and clearly show that they are the broken, reworked slabs 

 of a former thin-bedded black limestone whose fragments have not 

 been transported very far. 



Southwest along the strike, the conglomerate was found to 

 contain, in places, a few irregular masses of black slate. In places 

 a nodular condition was seen, as if mud had been deposited with 

 the lime. At Mystic Station good outcrops of conglomerate show 

 bedding. Some of the strata, particularly those with an abundance 

 of vein calcite, were only slightly conglomeratic, and were chiefly 

 composed of massive black limestone. A little farther south fossils 

 were found in the matrix. 



To obtain a complete picture of this conglomerate we must study 

 the outcrops on lot two and twenty-two, range six. In one place 

 the fragments have a peculiarly brecciated appearance. Pieces 

 of dove grey pure limestone compose the greater part of the beds. 

 The paste is of darker material, in places slaty and largely calcareous. 

 In one place above the more brecciated zone, a bed of massive, 

 partly broken grey limestone occurs. No paste seems to be mixed 

 in with this limestone; the broken fragments appear to have been 



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