I9I4.] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 407 

 The chemical analysis of this rock is as follows: 



Analysis F. 

 2ig A II. 



SiO, 18.42 



FeoOs 6.33 



ALO3 7-95 



MnO 21.44 



CaO 14.46 



MgO 5.01 



RO, 346 



H,0 2.58 



CO, 21.20 



Analysis F i. 

 Recalculation. 



MnO 9.36 



MnCOs 1922 



CaCO, 18 61 



MgCOa 10.54 



CaaCPOJ, 7-50 



Fe.Os 6.22 



SiO, 9.18 



2H,OAL03-2SiO, 19.61 



100.24 



100.85 



This bed is essentially a manganiferons argillaceous dolomite 

 with considerable percentages of barite, hematite, and phosphate. It 

 would seem quite reasonable to suppose that the phosphate 

 Ca3(P04)o exists in the nodular portion as we have found to be the 

 case in the nodules of 219 A 13 to be described later. 



'>e<ni^ 



Fig. 28. Microphotograph of red manganiferous shale from 219 An; 

 slide 278; enlarged 22 diam. ; showing hematite spherules in a groundmass of 

 manganese carbonate. 



