424 DALE— CAMBRIAN MANGANESE DEPOSITS OF [April 25, 



Brigus Section. — At Brigus South Head on the west shore of 

 Conception Bay (see Figs, i, 38, 39, 40, and 41) manganese is found 

 to a great extent in the oxidized state in several beds at the water's 

 edge in the shales of lower Cambrian age which make up the sharp 

 hog back ridge overlooking the " Needles." Because of the inac- 



Fig. 41. View of the " Needles " at the extremity of Brigus South Head, 

 showing the manganese zone (a-a). 



cessibility of that portion of the ridge where the manganese was 

 best preserved, detailed measurement of the section was not pos- 

 sible. Prof, van Ingen and Mr. A. O. Hayes in 1912 found that 

 the best manganese measured about 4.5 feet thick in a zone of 

 15 feet. Specimens collected from more accessible portions were 

 all practically altered to psilomelane but there is one which shows 

 the original jaspery carbonate quite similar to the types described in 

 connection with the Manuels occurrence. Several old prospect pits 

 on the more accessible parts of this ridge were examined by the 

 writer, but the manganese was found to be in its secondary state and 

 the interbedded shales in a very much disturbed condition. The 

 strike of the strata of this locality is N. 10 E. and the dip 47 E. 



