CAMBRIAN AND LOWER ORDOVICIAN. 151 



Feet. 

 Gray pure limestone, composed of commiauted organic remains, belonging to Paradoxidep, 



Bathyurua, and Salterella, as before 27 



Bluish-black soft shale, interstratified with gray, yellow-weathering dolomitic bands, as 



before 60 



Gray pure limestone, probably composed of comminuted organic remains as before; under- 

 laid by bluish-black shale inclosing nodules of blue compact limestone; some of which 



weather yeUowish-brown, and are probably magnesian 13 



Bluish-black soft shale of the same character as before, interstratified with a few beds of 

 quartzite 68 



623 



1,711 



The summit of the above section occurs on tlie east side of Deer Brook Baj^, on the East 

 Arm of Boime Bay, and its base about 6 or 7 miles up the East Arm from the mouth of Deer 

 Brook. All of the beds can be seen coming to the coast in succession, with a westward dip, 

 and an inclination of from 20° to 60°. WJiere the beds of the base were observed, the measures 

 appear to fold over an anticlinal axis, and for about 100 yards they dip to the eastward. For 

 2 mUes beyond this, along the east side of East Bay, the greatest confusion prevails, and nothing 

 reliable ia regard to the sequence can be obtained from the exposures. East Bay and West 

 Bay are two deep southward parallel indentations of the coast, which form the extremity of 

 the East Arm. The area between them is from 1 to 2 miles wide, and the strata in it appear 

 to lie in the form of a synclinal. The axis of this syncluial would run about north and south, 

 and ia the former direction it would strike to the eastward of the anticlinal just mentioned as 

 occurring on the north side of the East Arm, whUe the axis of this anticlinal would strike into 

 West Bay. The distance across the East Arm, on the axis of the synclinal, from the position 

 where the lowest beds of the section above given would come upon it to the position where it 

 would be crossed by the lowest beds between East and West bays would be about the same 

 as that occupied by the whole section between the Laurentian gneiss and the coast of Deer 

 Brook Bay. On the west side of this bay there occur some limestones of a peculiar color and 

 character, whose stratigraphical place would be a few hundred feet above the highest beds in 

 the section just given. About the same distance above the base of the strata between East 

 and West bays similar limestones occur; and there is therefore not much doubt that the 

 strata between these bays come in immediate or proximate sequence to those already given 

 in section C. These additional strata are as follows : 



* C — Continued. 



Feet. 



10. White quartzite, in beds of from 2 to 3 feet thick, interatratified with striped oUve-drab and 



black compact arenaceous magnesian brown-weathering limestone, which constitutes one- 

 fourth of the mass and holds small disseminated masses of iron pyrites 58 



11. Strata concealed 150 



12. Blackish-gray limestone; it is divided into beds of from 2 to 8 inches, and under the influence 



of the weather breaks up into thin scales 54 



13. Smoke-gray compact pure limestone, striped with ocher-yeUow arenaceo-ferruginous lime- 



stone, passing into brick-red. The gray and yellow alternate in lenticular layers, varying 

 in thickness from a quarter to half an inch, and the rock presents a very peculiar and 

 striking aspect. The yellow and red colors may be the effect of weathering, but in break- 

 ing up the rock the same alternation of these with the gray limestone was apparent in the 

 interior. Bock of the same character occurs on the west side of Deer Brook Bay 30 



14. Olive-gray, brown-weathering ferruginous sandy dolomite, containing thin lenticular patches 



and thin beds of pure smoke-gray limestone, with disseminated cubes and small masses of 

 iron pjstites 17 



309 



